diff --git a/1-report_repair/.gitignore b/1-report_repair/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/1-report_repair/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/1-report_repair/.vscode/tasks.json b/1-report_repair/.vscode/tasks.json
new file mode 100644
index 0000000..ffef723
--- /dev/null
+++ b/1-report_repair/.vscode/tasks.json
@@ -0,0 +1,13 @@
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+			],
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+		}
+	]
+}
\ No newline at end of file
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new file mode 100644
index 0000000..99c15ac
--- /dev/null
+++ b/1-report_repair/Cargo.lock
@@ -0,0 +1,239 @@
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diff --git a/1-report_repair/Cargo.toml b/1-report_repair/Cargo.toml
new file mode 100644
index 0000000..0cd0894
--- /dev/null
+++ b/1-report_repair/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "report_repair"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+itertools = "0.9.0"
+structopt = "0.3.20"
diff --git a/1-report_repair/data/input.txt b/1-report_repair/data/input.txt
new file mode 100644
index 0000000..ee00017
--- /dev/null
+++ b/1-report_repair/data/input.txt
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diff --git a/1-report_repair/src/main.rs b/1-report_repair/src/main.rs
new file mode 100644
index 0000000..433fb5a
--- /dev/null
+++ b/1-report_repair/src/main.rs
@@ -0,0 +1,66 @@
+use std::io::{BufRead, BufReader};
+use std::path::{PathBuf, Path};
+use std::fs::File;
+use itertools::Itertools;
+
+use structopt::StructOpt;
+
+
+#[derive(StructOpt, Debug)]
+struct Opt {
+    /// Input file
+    #[structopt(parse(from_os_str))]
+    input_file: PathBuf,
+}
+
+fn main() {
+    // Check argv
+    let opts = Opt::from_args();
+    // eprintln!("opts = {:?}",   opts);
+    // Load file if possible
+    let file_path = Path::new(&opts.input_file);
+    let input = File::open(file_path).unwrap();
+    let buffered_input = BufReader::new(input);
+    let lines: Vec<String> = buffered_input.lines().filter_map(Result::ok).collect();
+    // eprintln!("lines_iter = {:?}", lines_iter);
+
+    /* First, naïve solution */
+    // while let Some(line) = lines_iter.next() {
+    //     let iter_clone = lines_iter.clone();
+    //     // eprintln!("iter_clone = {:#?}", iter_clone);
+    //     for line2 in iter_clone {
+    //         let l1: i64 = line.parse().unwrap();
+    //         let l2: i64 = line2.parse().unwrap();
+    //         if l1 + l2 == 2020 {
+    //             eprintln!("l1 = {:#?}", l1);
+    //             eprintln!("l2 = {:#?}", l2);
+    //             dbg!(l1 + l2);
+    //             dbg!(l1 * l2);
+    //         }
+    //     }
+    // }
+
+    let res_two = find_2_sum_to_2020(lines.iter().filter_map(|x| Result::ok(x.parse::<i64>())).collect());
+    let res_three = find_3_sum_to_2020(lines.iter().filter_map(|x| Result::ok(x.parse::<i64>())).collect());
+    //let res_three = find_sum_to_2020(3);
+}
+
+fn find_3_sum_to_2020(numbers: Vec<i64>) -> Option<(i64,i64, i64)> {
+    for (i,j, k) in numbers.into_iter().tuple_combinations() {
+        if i + j + k == 2020 {
+            println!("Found {} and {} and {} whose sum is {} and whose product is {}", i, j, k, i+j+k, i*j*k);
+            return Some((i,j,k));
+        }
+    }
+    None
+}
+
+fn find_2_sum_to_2020(numbers: Vec<i64>) -> Option<(i64,i64)> {
+    for (i,j) in numbers.iter().tuple_combinations() {
+        if i + j == 2020 {
+            println!("Found {} and {} whose sum is {} and whose product is {}", i, j, i+j, i*j);
+            return Some((*i,*j));
+        }
+    }
+    None
+}
diff --git a/2-password_philosophy/.gitignore b/2-password_philosophy/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/2-password_philosophy/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/2-password_philosophy/Cargo.lock b/2-password_philosophy/Cargo.lock
new file mode 100644
index 0000000..117f472
--- /dev/null
+++ b/2-password_philosophy/Cargo.lock
@@ -0,0 +1,70 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "anyhow"
+version = "1.0.35"
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+checksum = "2c0df63cb2955042487fad3aefd2c6e3ae7389ac5dc1beb28921de0b69f779d4"
+
+[[package]]
+name = "password_philosophy"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "thiserror",
+]
+
+[[package]]
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+ "unicode-xid",
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+ "proc-macro2",
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+ "proc-macro2",
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+ "unicode-xid",
+]
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+ "thiserror-impl",
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+
+[[package]]
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+checksum = "9ba20f23e85b10754cd195504aebf6a27e2e6cbe28c17778a0c930724628dd56"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
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+[[package]]
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diff --git a/2-password_philosophy/Cargo.toml b/2-password_philosophy/Cargo.toml
new file mode 100644
index 0000000..3d26b36
--- /dev/null
+++ b/2-password_philosophy/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "password_philosophy"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.35"
+thiserror = "1.0.22"
diff --git a/2-password_philosophy/data/input.txt b/2-password_philosophy/data/input.txt
new file mode 100644
index 0000000..082b283
--- /dev/null
+++ b/2-password_philosophy/data/input.txt
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diff --git a/2-password_philosophy/src/main.rs b/2-password_philosophy/src/main.rs
new file mode 100644
index 0000000..cc82f93
--- /dev/null
+++ b/2-password_philosophy/src/main.rs
@@ -0,0 +1,111 @@
+use std::ops::RangeInclusive;
+use anyhow::Result;
+
+#[derive(Debug, PartialEq)]
+struct PasswordPolicy {
+    char: u8,
+    range: RangeInclusive<usize>,
+}
+
+impl PasswordPolicy {
+    fn check_password(&self, password: &str) -> bool {
+        self.range.contains(
+            &password
+                .as_bytes()
+                .iter().
+                filter(|&&c| c == self.char)
+                .count()
+        )
+    }
+    
+    fn check_password_newpolicy(&self, password: &str) -> bool {
+        (password.chars().nth(self.range.start()-1).unwrap() as u8 == self.char) ^ (password.chars().nth(self.range.end()-1).unwrap() as u8 == self.char)
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+enum ParseError {
+    #[error("Expected {0}")]
+    Expected(&'static str)
+}
+
+fn parse_line(line: &str) -> Result<(PasswordPolicy,String)> {
+    let (policy_s, password) = {
+        let mut tokens = line.split(": ");
+        (
+            tokens.next().ok_or(ParseError::Expected("Coucou"))?,
+            tokens.next().ok_or(ParseError::Expected("Coincoin"))?,
+        )
+    };
+    let policy = {
+        let (range_s, char_s) = {
+            let mut tokens = policy_s.split(' ');
+            (
+                tokens.next().ok_or(ParseError::Expected("Range"))?,
+                tokens.next().ok_or(ParseError::Expected("Char"))?,
+            )
+        };
+        let (min_s, max_s) = {
+            let mut tokens = range_s.split('-');
+            (
+                tokens.next().ok_or(ParseError::Expected("Min"))?,
+                tokens.next().ok_or(ParseError::Expected("Max"))?,
+            )
+        };
+        PasswordPolicy {
+            char: if char_s.len() == 1 {
+                char_s.as_bytes()[0]
+            } else {
+                // return Err(ParseError::Expected("policy byte to be exactly one byte"));
+                return Err(ParseError::Expected("password policy byte to be exactly 1 byte").into());
+            },
+            range: (min_s.parse()?)..=(max_s.parse()?),
+        }
+    };
+    Ok((policy, password.to_string()))
+}
+
+fn main() -> Result<()> {
+    let count = include_str!("../data/input.txt")
+        .lines()
+        .map(parse_line)
+        .map(Result::unwrap)
+        .filter(|(policy,password)| policy.check_password(password))
+        .count();
+    println!("{} passes are valid", count);
+    let count_new_policy = include_str!("../data/input.txt")
+        .lines()
+        .map(parse_line)
+        .map(Result::unwrap)
+        .filter(|(policy,password)| policy.check_password_newpolicy(password))
+        .count();
+    println!("{} passes are valid with new policy", count_new_policy);
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_is_valid() {
+        let policy = PasswordPolicy{ char: b'b', range: 1..=4 };
+        assert_eq!(policy.check_password("boumbaby"), true);
+        assert_eq!(policy.check_password("b-b-b-boumbaby"), false);
+        assert_eq!(policy.check_password("oumay"), false);
+    }
+
+    #[test]
+    fn test_parse_line() {
+        assert_eq!(
+            parse_line("1-5 b: boulbi").unwrap(),
+            (
+                PasswordPolicy {
+                    char: b'b',
+                    range: 1..=5,
+                },
+                "boulbi".to_owned(),
+            )
+        )
+    }
+}
diff --git a/3-toboggan_trajectory/.gitignore b/3-toboggan_trajectory/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/3-toboggan_trajectory/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/3-toboggan_trajectory/Cargo.lock b/3-toboggan_trajectory/Cargo.lock
new file mode 100644
index 0000000..85fa51a
--- /dev/null
+++ b/3-toboggan_trajectory/Cargo.lock
@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "toboggan_trajectory"
+version = "0.1.0"
diff --git a/3-toboggan_trajectory/Cargo.toml b/3-toboggan_trajectory/Cargo.toml
new file mode 100644
index 0000000..777a780
--- /dev/null
+++ b/3-toboggan_trajectory/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "toboggan_trajectory"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/3-toboggan_trajectory/data/input.txt b/3-toboggan_trajectory/data/input.txt
new file mode 100644
index 0000000..d193cf2
--- /dev/null
+++ b/3-toboggan_trajectory/data/input.txt
@@ -0,0 +1,323 @@
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diff --git a/3-toboggan_trajectory/src/lib.rs b/3-toboggan_trajectory/src/lib.rs
new file mode 100644
index 0000000..c36a494
--- /dev/null
+++ b/3-toboggan_trajectory/src/lib.rs
@@ -0,0 +1,133 @@
+use std::{fmt};
+
+#[derive(Clone, Copy, PartialEq)]
+pub enum Terrain {
+    Plain,
+    Tree,
+}
+
+impl Default for Terrain {
+    fn default() -> Self {
+        Terrain::Plain
+    }
+}
+
+impl fmt::Debug for Terrain {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", match self {
+            Terrain::Plain => '.',
+            Terrain::Tree => '#',
+        })
+    }
+}
+
+#[derive(Debug, Copy, Clone, PartialEq, Default)]
+pub struct Vec2 {
+    pub x: i64,
+    pub y: i64,
+}
+
+impl From<(i64, i64)> for Vec2 {
+    fn from((x,y): (i64, i64)) -> Self {
+        Self { x, y }
+    }
+}
+
+#[derive(Clone)]
+pub struct Map {
+    size: Vec2,
+    tiles: Vec<Terrain>
+}
+
+impl fmt::Debug for Map {
+    fn fmt(&self,f: &mut fmt::Formatter) -> fmt::Result {
+        // A most honourable moment, but chaining debugs means lots of spare ""[]
+        //let dd: Vec<String> = self.tiles.chunks_exact(self.size.x as usize).map(|x| format!("{:?}", x)).collect();
+        for line in self.tiles.chunks_exact(self.size.x as usize) {
+            let line_s: String = line.iter().map(|x| format!("{:?}", x)).collect();
+            writeln!(f, "{}", line_s)?
+        }
+        // let banana = self.tiles
+        //     .chunks_exact(self.size.x as usize)
+        //     .map(|x| format!("{:?}", x))
+        //     .collect::<Vec<String>>()
+        //     .join("\n");
+        // writeln!(f, "{}", banana)
+        Ok(())
+    }
+}
+
+impl Map {
+    pub fn new(size: Vec2) -> Self {
+        Self {
+            size,
+            tiles: vec![Default::default();(size.x*size.y) as usize]
+        }
+    }
+
+    pub fn get(&self, pos: Vec2) -> Terrain {
+        self.tiles[self.idx(pos).unwrap_or_default()]
+    }
+
+    pub fn set(&mut self, pos: Vec2, tile: Terrain) {
+        if let Some(idx) = self.idx(pos) {
+            self.tiles[idx] = tile;
+        }
+    }
+
+    fn wrap_coords(&self, pos: Vec2) -> Option<Vec2> {
+        if !(0..=self.size.y).contains(&pos.y) {
+            None
+        } else {
+            Some(Vec2{
+                x: pos.x % self.size.x,
+                y: pos.y})
+        }
+    }
+
+    fn idx(&self, pos: Vec2) -> Option<usize> {
+        self.wrap_coords(pos).map(|pos| (pos.x + pos.y * self.size.x) as usize)
+    }
+
+    pub fn from_bytes(s: &[u8]) -> Self {
+        let rows = s.iter().filter(|&&x| x == b'\n').count();
+        let cols = (s.len() - rows) / rows;
+        println!("Size : {} {}", rows, cols);
+        let mut res = Self::new((cols as i64,rows as i64).into());
+
+        let mut pos = Vec2 { x: 0, y: 0 };
+        for tile in s {
+            match tile {
+                b'\n' => {
+                    pos.y += 1;
+                    pos.x = 0;
+                }
+                b'#' => {
+                    res.set(pos, Terrain::Tree);
+                    pos.x += 1;
+                }
+                _ => {
+                    res.set(pos, Terrain::Plain);
+                    pos.x += 1;
+                }
+            }
+        }
+        res
+    }
+
+    pub fn solve(&self, slope: (i64, i64)) -> i64 {
+        let mut seek_pos = Vec2 { x: 0, y: 0};
+        let mut tree_count = 0;
+        loop {
+            if self.get(seek_pos) == Terrain::Tree {
+                tree_count += 1;
+            }
+            if seek_pos.y + slope.1 >= self.size.y {
+                break;
+            }
+            seek_pos.y += slope.1;
+            seek_pos.x += slope.0;
+        } 
+        tree_count
+    }
+}
\ No newline at end of file
diff --git a/3-toboggan_trajectory/src/main.rs b/3-toboggan_trajectory/src/main.rs
new file mode 100644
index 0000000..ddad4b3
--- /dev/null
+++ b/3-toboggan_trajectory/src/main.rs
@@ -0,0 +1,17 @@
+use toboggan_trajectory::*;
+
+fn main() {
+    let map_str = include_str!("../data/input.txt");
+    // println!("{}", map_str);
+    let map: Map = Map::from_bytes(map_str.as_bytes());
+    // println!("{:#?}", map);
+    eprintln!("First part solution = {}", map.solve((3,1)));
+    let sols: i64 = vec![
+        (1, 1),
+        (3, 1),
+        (5, 1),
+        (7, 1),
+        (1, 2),
+    ].iter().map(|slope| map.solve(*slope)).product();
+    println!("Second part solution = {}", sols);
+}
\ No newline at end of file
diff --git a/3-toboggan_trajectory/src/tests.rs b/3-toboggan_trajectory/src/tests.rs
new file mode 100644
index 0000000..7b38d93
--- /dev/null
+++ b/3-toboggan_trajectory/src/tests.rs
@@ -0,0 +1,54 @@
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_vec2_from_tuple() {
+        // let v: Vec2 = (32, 75).into();
+        let v = Vec2::from((32, 75));
+        assert_eq!(v, Vec2 {x: 32, y: 75})
+    }
+    #[test]
+    fn test_format_map() {
+        let m = Map{
+            size: Vec2{x: 2, y:2},
+            tiles: vec!(Terrain::Tree, Terrain::Plain, Terrain::Plain, Terrain::Plain)
+        };
+        assert_eq!(format!("{:?}", m), "#.\n..\n")
+    }
+
+    #[test]
+    fn test_normalize_pos() {
+        let m = Map::new((2, 2).into());
+        assert_eq!(m.normalize_pos((0, 0).into()), Some((0, 0).into()));
+        assert_eq!(m.normalize_pos((1, 0).into()), Some((1, 0).into()));
+        assert_eq!(m.normalize_pos((2, 0).into()), Some((0, 0).into()));
+        assert_eq!(m.normalize_pos((-1, 0).into()), Some((1, 0).into()));
+        assert_eq!(m.normalize_pos((-2, 0).into()), Some((0, 0).into()));
+        assert_eq!(m.normalize_pos((0, -1).into()), None);
+        assert_eq!(m.normalize_pos((0, 2).into()), None);
+    }
+
+    #[test]
+    fn test_index() {
+        let m = Map::new((3, 5).into());
+        assert_eq!(m.index((0, 0).into()), Some(0));
+        assert_eq!(m.index((2, 0).into()), Some(2));
+        assert_eq!(m.index((0, 1).into()), Some(3));
+        assert_eq!(m.index((2, 1).into()), Some(5));
+    }
+
+    #[test]
+    fn test_create_map() {
+        let mut map = Map::new(Vec2{x:5,y:5});
+        let trees: Vec<Vec2> = vec![
+            (1,2).into(),
+            (2,1).into(),
+            (3,3).into(),
+            (1,4).into(),
+            (5,1).into(),
+        ];
+        trees.iter().for_each(|pos| map.set(*pos, Terrain::Tree));
+        println!("{:?}", map)
+    }
+}
\ No newline at end of file
diff --git a/4-passport_processing/.gitignore b/4-passport_processing/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/4-passport_processing/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/4-passport_processing/Cargo.lock b/4-passport_processing/Cargo.lock
new file mode 100644
index 0000000..a048670
--- /dev/null
+++ b/4-passport_processing/Cargo.lock
@@ -0,0 +1,119 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "aho-corasick"
+version = "0.7.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7404febffaa47dac81aa44dba71523c9d069b1bdc50a77db41195149e17f68e5"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "anyhow"
+version = "1.0.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68803225a7b13e47191bab76f2687382b60d259e8cf37f6e1893658b84bb9479"
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/4-passport_processing/Cargo.toml b/4-passport_processing/Cargo.toml
new file mode 100644
index 0000000..7878faa
--- /dev/null
+++ b/4-passport_processing/Cargo.toml
@@ -0,0 +1,10 @@
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diff --git a/4-passport_processing/data/input.txt b/4-passport_processing/data/input.txt
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+hgt:177in ecl:amb pid:1589147420 iyr:2011 hcl:#4bf920
+cid:252
+
+ecl:oth eyr:2022
+byr:1948
+pid:177cm cid:90 hgt:102 hcl:z iyr:2028
+
+hgt:157cm pid:233347213
+hcl:z
+byr:2009 eyr:2027 cid:235 ecl:blu
+iyr:1965
+
+ecl:blu iyr:2030 eyr:2028 hcl:#18171d pid:322593908 byr:1954
+cid:215 hgt:63in
+
+hgt:72cm
+cid:345 pid:911728732 eyr:2025
+byr:2004 ecl:#0c4af7 hcl:3bb675
+
+pid:171714794 byr:2019
+hcl:#866857
+cid:290 hgt:183in ecl:#d0c30f eyr:2032
+
+iyr:2016 pid:905945155 hcl:#ceb3a1 byr:1958 hgt:159cm eyr:2028 cid:180 ecl:oth
+
+hcl:efb614
+eyr:2022 hgt:177cm pid:46962273
+byr:1974
+ecl:#089bdd iyr:1988
+
+pid:662993164 iyr:2011 eyr:2025 ecl:hzl
+byr:1942 hcl:#fffffd
+hgt:175cm
+
+hcl:#7d3b0c iyr:2016 hgt:175cm eyr:2022 pid:953132241
+byr:1963 cid:261 ecl:grn
+
+iyr:2013 hgt:180cm cid:318
+ecl:amb
+byr:1985 pid:439097817 eyr:2029 hcl:#602927
+
+hgt:162cm ecl:blu
+pid:675749832 cid:73
+byr:1940 hcl:#888785
+eyr:2026
+
+pid:275352007 iyr:2012 eyr:2020
+ecl:amb hcl:#623a2f hgt:175cm cid:317 byr:1988
+
+hcl:z hgt:164in
+iyr:2026 eyr:1961 ecl:#2df35e pid:#5c9ed5 cid:341
+
+pid:848086119 ecl:oth eyr:2021 iyr:2011 hgt:180cm byr:1923 hcl:#93461b
+
+eyr:2028
+iyr:2014
+byr:1978
+hgt:184cm
+pid:966277564 ecl:hzl
+cid:176
+
+hcl:#888785 ecl:amb cid:329 pid:835961958 byr:1927 eyr:2028 iyr:2016
+
+pid:160cm eyr:2026 hcl:#08714b
+ecl:hzl iyr:1961
+hgt:156cm byr:1984
+
+ecl:gry cid:302
+byr:1965
+iyr:2019 hcl:#ceb3a1 eyr:2027 pid:458192010 hgt:156cm
+
+pid:058273969 byr:1942 eyr:2027
+hcl:#c0946f iyr:2013 hgt:179cm
+
+iyr:2019 hgt:193in pid:52144528 eyr:2036
+cid:169 ecl:grt hcl:7e7039
+
+hgt:192cm ecl:blu iyr:2015 pid:544936486 eyr:2024
+byr:1972 hcl:#c0946f
+
+eyr:2000
+hcl:78de23 byr:2020
+hgt:171in pid:160cm cid:68
+iyr:1956 ecl:gmt
+
+hcl:#733820 ecl:grn iyr:2018
+byr:2001 pid:770957230
+
+cid:103 ecl:grn iyr:2018
+pid:068344094
+eyr:2023 hgt:69in byr:1984 hcl:#6b5442
+
+hgt:193cm eyr:2021 ecl:grn hcl:#602927 byr:1938 iyr:2011
+
+iyr:1931
+hcl:c0a318
+pid:99195939
+byr:2028 ecl:grt hgt:164 eyr:2017
+
+eyr:1980
+ecl:zzz
+hgt:98 cid:161
+pid:#96fe01 hcl:z
+iyr:1974
+
+byr:1936 hgt:176cm pid:56797167 iyr:2015
+ecl:#07ad47
+hcl:z
+
+pid:48720181 hcl:270e76
+byr:2022
+hgt:180cm ecl:#dde399
+eyr:2035 iyr:2023
+
+eyr:2030 byr:2022 iyr:2018 hgt:162in ecl:gry
+hcl:#63e2ec pid:615812600
+
+ecl:grn
+cid:56 hcl:#623a2f eyr:2020 hgt:167cm byr:1971 iyr:2012
+pid:262692066
+
+hgt:61 hcl:#efcc98 iyr:2011 eyr:2026
+byr:1938
+ecl:amb pid:385025739
+
+pid:972423724 hcl:#602927 eyr:2027 ecl:oth iyr:2015
+hgt:158cm byr:1956
+
+pid:530035096
+ecl:hzl
+iyr:2017
+eyr:2024 hcl:#888785 byr:1962 hgt:64in
+
+byr:1935 eyr:2022 ecl:grn hcl:#7d3b0c pid:294714199
+
+eyr:2029
+iyr:2013
+byr:1927 hgt:175cm pid:058261075 hcl:#cfa07d ecl:amb
+
+ecl:blu pid:188764763 hgt:155cm byr:1921
+iyr:2018 eyr:2029 hcl:#b6652a
+
+byr:1975 hcl:930e76 iyr:2019
+pid:169cm eyr:2009 hgt:191
+ecl:#d28c56
+
+hcl:z
+pid:3190617557
+hgt:160cm cid:80 ecl:oth iyr:2022 eyr:2008
+byr:2016
+
+hcl:#888785 byr:1999 ecl:blu cid:238 iyr:2018 hgt:160cm
+eyr:2028 pid:174517111
+
+eyr:2035
+hcl:z byr:2020
+pid:262135957 cid:324 iyr:2016 hgt:161cm ecl:grn
+
+byr:1936
+ecl:grn
+iyr:2013 hcl:#623a2f eyr:2029 hgt:166cm
+
+hcl:#cfa07d hgt:159cm eyr:2021
+ecl:hzl
+iyr:2014 pid:816039817 byr:1935
+
+pid:596634790 hgt:161cm
+eyr:2036 iyr:2016
+hcl:#7d3b0c byr:2015 ecl:brn
+
+byr:1952
+hgt:157cm eyr:2024 cid:60 pid:876160626
+ecl:blu iyr:2011 hcl:z
+
+hgt:193cm iyr:2020 eyr:2026
+pid:0136642346 ecl:hzl hcl:#efcc98 byr:1995
+
+byr:1934 hgt:177cm
+pid:445993865
+ecl:brn iyr:2018
+eyr:2030
+hcl:#733820
+
+eyr:2021 hgt:71in
+pid:918630878
+hcl:#602927 iyr:2017 byr:1943
+ecl:gry
+
+ecl:#81de2c iyr:2021 hgt:176cm eyr:1947 hcl:#888785 pid:1370052400
+
+ecl:amb
+byr:1922 iyr:2012 eyr:2022 pid:098866466 hcl:#18171d hgt:63in
+
+eyr:2028 iyr:2010 hcl:184355
+byr:1968 pid:337089458 ecl:brn hgt:181cm
+
+hcl:#733820 pid:225958483 ecl:gry eyr:2030 hgt:62in iyr:2012 byr:1987
+
+eyr:1955
+hcl:03199c
+pid:#3e832e
+byr:2014 ecl:#453931 hgt:70cm
+
+byr:1975
+ecl:blu hcl:#7d3b0c
+cid:169 pid:582470437 hgt:151cm
+iyr:2019 eyr:2027
+
+iyr:2017 byr:1971 pid:343492418 hgt:150cm hcl:#fffffd eyr:2024
+
+byr:1997
+eyr:2026
+cid:257 hcl:#7d3b0c ecl:blu hgt:166cm iyr:2016 pid:117625518
+
+iyr:2014 cid:248 hgt:165cm hcl:#18171d pid:294270262
+byr:1925 ecl:amb
+eyr:2028
+
+hgt:167in ecl:dne pid:174cm iyr:2019 byr:2005 hcl:b29331 cid:86
+
+hcl:#733820 pid:259969636 eyr:2023
+ecl:hzl cid:317
+hgt:185cm byr:2025
+iyr:2012
+
+hcl:#cfa07d hgt:152cm pid:807755992 iyr:2020
+byr:1922 ecl:grn eyr:2025 cid:241
+
+pid:997807107 byr:1958 ecl:dne iyr:2013 eyr:2023 hcl:#18171d
+hgt:152cm
+
+ecl:blu hgt:170cm
+byr:1932
+pid:775223495 eyr:2024 iyr:2015
+
+iyr:2011
+ecl:grn hcl:#ceb3a1 pid:190577415
+hgt:63in
+eyr:2021
+byr:1986
+
+ecl:oth eyr:2025 hgt:180cm
+pid:258195402 iyr:2017
+byr:1961
+cid:109 hcl:#888785
+
+hgt:178cm byr:1952 eyr:2023 hcl:#733820
+pid:106939563 ecl:brn iyr:2012
+
+hgt:188cm iyr:2012 hcl:#fffffd byr:1942
+ecl:brn pid:804371742
+
+byr:1978 cid:120
+eyr:2026 pid:405714523 hgt:60in
+hcl:#a97842 ecl:blu
+iyr:2017
+
+iyr:2015 byr:1958 ecl:grn
+hcl:#b6652a pid:#9e8af3
+eyr:2026 hgt:167cm
+
+hgt:171cm hcl:#888785
+cid:274
+ecl:grn pid:919263460 eyr:2023 iyr:2020
+
+pid:606726472 eyr:2022
+byr:2008
+ecl:zzz cid:72 hgt:173in
+
+eyr:2032 byr:2004
+hcl:z iyr:2011 ecl:hzl
+pid:523494728
+hgt:70cm
+
+hgt:169cm pid:755822781 byr:1984 ecl:hzl hcl:#6b5442 iyr:2014
+
+eyr:2020
+byr:1942 cid:85
+hgt:157cm pid:558287447 hcl:#efcc98
+ecl:hzl
+
+byr:1980 cid:225 pid:367501996 iyr:2016 ecl:grn hcl:#efcc98
+hgt:175cm eyr:2029
+
+pid:264780775 hgt:182cm ecl:grn
+hcl:#18171d
+eyr:2024
+byr:1926 iyr:2013
+
+byr:1969 iyr:2015
+eyr:2026 ecl:blu
+hcl:#fffffd
+pid:005695878 cid:273
+
+ecl:brn byr:2006 hgt:152cm
+hcl:#888785
+pid:171cm cid:249 iyr:2026
+eyr:2022
+
+byr:2011 iyr:2020 ecl:zzz hcl:z pid:412624100
+eyr:2031
+
+cid:111 hcl:df9bd0
+iyr:2022 ecl:#32fdf9
+byr:2017 eyr:2000
+hgt:166in pid:0654651026
+
+eyr:2021
+ecl:gry pid:587324819 hgt:187cm byr:1951 hcl:#6b5442
+
+iyr:2011
+pid:180780096 hcl:#623a2f ecl:amb hgt:160cm byr:1991 eyr:2026
+
+byr:2022 hgt:152cm eyr:2023 cid:70 ecl:grn
+hcl:e0a24e
+iyr:1959 pid:77110462
+
+pid:251982311 byr:1994 ecl:gry hgt:165cm eyr:2021
+hcl:#623a2f
+iyr:2019
+
+ecl:blu byr:1945
+cid:241
+pid:732768808 hcl:#efcc98
+hgt:171cm eyr:2020 iyr:2012
+
+cid:243 eyr:2001
+hcl:01a022
+hgt:162 pid:507703455
+byr:2003 ecl:#c6a07b
+iyr:1941
+
+hcl:#733820 cid:150
+ecl:hzl pid:843607639 hgt:190cm
+byr:1958
+eyr:2025
+
+eyr:2030
+pid:489370607 iyr:2014 ecl:oth hcl:#cfa07d byr:1995 hgt:193cm
+
+hgt:68in
+byr:1933
+iyr:2010 ecl:brn
+pid:380075958
+hcl:#623a2f cid:279
+eyr:2025
+
+iyr:2019
+byr:2001
+hcl:#cfa07d ecl:brn pid:349877352
+hgt:161cm eyr:2029
+
+hgt:171cm
+eyr:2040 ecl:dne hcl:#6b5442 iyr:2020 byr:1990
+
+hcl:#fffffd
+hgt:154cm
+byr:1979 eyr:2020 iyr:2018
+pid:118713281 cid:174
+
+hcl:#7d3b0c eyr:2030 ecl:brn iyr:2017
+cid:184 hgt:180cm pid:504181498 byr:1925
+
+hgt:150cm
+eyr:2020 byr:1999 hcl:#a97842 iyr:2011 ecl:grn pid:620166468
+
+hcl:#602927
+iyr:2015
+byr:1928
+pid:083747352
+eyr:2027 hgt:193cm
+ecl:hzl
+
+byr:1938 ecl:gry
+pid:511669464 eyr:1973 hgt:70cm
+cid:262 iyr:2015 hcl:#c0946f
+
+eyr:2029
+byr:1923 hgt:160cm hcl:#7d3b0c iyr:2013 pid:525837692 ecl:gry
+
+hcl:#602927 eyr:2025
+pid:232338168 hgt:174cm cid:322 iyr:2010 ecl:oth
+
+hgt:192in cid:126 hcl:#6b5442
+pid:101406211 byr:1922 ecl:hzl eyr:2022 iyr:2013
+
+eyr:2026 ecl:amb
+byr:1921
+cid:336
+iyr:2020 hgt:182cm pid:533626984
+
+pid:411943955 ecl:amb eyr:2025 hgt:166cm byr:1964 hcl:#341e13 cid:285
+iyr:2010
+
+ecl:grn byr:1933 eyr:2024
+hgt:153cm
+hcl:#5cfb31 iyr:2019 pid:773885967
+
+ecl:hzl pid:426060511
+hgt:159cm
+byr:1922 hcl:#6ffd04 iyr:2017
+
+byr:2025 pid:#097d1b iyr:2020 eyr:2029 hcl:73d113 hgt:69cm ecl:utc
+
+ecl:amb hgt:170cm eyr:2025 byr:1930 iyr:2018 hcl:#733820
+cid:262
+
+iyr:2019
+eyr:2021
+cid:65 pid:258615618
+ecl:oth byr:1987
+hcl:#efcc98
+hgt:178cm
+
+hcl:z eyr:1980 ecl:#1c5fd1 hgt:65cm byr:2014
+cid:222 pid:#c69fd5 iyr:2020
+
+cid:271 pid:#4b8380 hcl:80fab0
+byr:2024 ecl:#20e25f
+iyr:1945
+eyr:1935 hgt:159cm
diff --git a/4-passport_processing/src/main.rs b/4-passport_processing/src/main.rs
new file mode 100644
index 0000000..4a6a42a
--- /dev/null
+++ b/4-passport_processing/src/main.rs
@@ -0,0 +1,191 @@
+use std::{collections::HashMap, str::FromStr};
+use anyhow::Result;
+use regex::Regex;
+
+#[derive(Debug,thiserror::Error)]
+enum ParseError {
+    #[error("Expected {0}")]
+    Expected(String)
+}
+
+#[derive(Debug,PartialEq, Eq, Hash)]
+enum EntryType {
+    Byr,
+    Iyr,
+    Eyr,
+    Hgt,
+    Hcl,
+    Ecl,
+    Pid,
+    Cid,
+}
+
+impl FromStr for EntryType {
+    type Err = ParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "byr" => Ok(Self::Byr),
+            "iyr" => Ok(Self::Iyr),
+            "eyr" => Ok(Self::Eyr),
+            "hgt" => Ok(Self::Hgt),
+            "hcl" => Ok(Self::Hcl),
+            "ecl" => Ok(Self::Ecl),
+            "pid" => Ok(Self::Pid),
+            "cid" => Ok(Self::Cid),
+            _ => Err(ParseError::Expected(format!("byr, iyr, eyr, hgt, hcl, ecl, pid, cid, but got {}", s)))
+        }
+    }
+}
+
+impl EntryType {
+    pub fn is_valid(&self, value: &Option<&str>) -> bool {
+        match (*value, self) {
+            (Some(value), EntryType::Byr) => {
+                // four digits; at least 1920 and at most 2002.
+
+                match str::parse::<i64>(value) {
+                    Ok(number) => {
+                        (1920..=2002).contains(&number)
+                    }
+                    Err(_) => { false }
+                }
+            }
+            (Some(value), EntryType::Iyr) => {
+                // four digits; at least 2010 and at most 2020.
+                match str::parse::<i64>(value) {
+                    Ok(number) => {
+                        (2010..=2020).contains(&number)
+                    }
+                    Err(_) => { false }
+                }
+            }
+            (Some(value), EntryType::Eyr) => {
+                // four digits; at least 2020 and at most 2030.
+                match str::parse::<i64>(value) {
+                    Ok(number) if (2020..=2030)
+                        .contains(&number) => true,
+                    _ =>  false
+                }
+            }
+            (Some(value), EntryType::Hgt) => {
+                // a number followed by either cm or in:
+                // if cm, the number must be at least 150 and at most 193.
+                // if in, the number must be at least 59 and at most 76.
+                let rex_cm = Regex::new(r"(\d*)cm").unwrap();
+                let rex_in = Regex::new(r"(\d*)in").unwrap();
+                if rex_cm.is_match(value) {
+                    let m = rex_cm.captures(value);
+                    // At least "None" fails the test
+                    match str::parse::<i64>(m.unwrap().get(1).unwrap().as_str()) {
+                        Ok(height) if (150..=193).contains(&height) => true,
+                        _ => false 
+                    }
+                } else if rex_in.is_match(value) {
+                    let m = rex_in.captures(value);
+                    // At least "None" fails the test
+                    match str::parse::<i64>(m.unwrap().get(1).unwrap().as_str()) {
+                        Ok(height) if (59..=76).contains(&height) => true,
+                        _ => false 
+                    }
+                } else {
+                    false
+                }
+            }
+            (Some(value), EntryType::Hcl) => {
+                // a # followed by exactly six characters 0-9 or a-f.
+                //probably ok as long as we deal with ascii right ?
+                let rex = Regex::new(r"([a-z]|[0-9]){6}").unwrap();
+                value.starts_with('#') && rex.is_match(&(value.chars().skip(1).collect::<String>()))
+            }
+            (Some(value), EntryType::Ecl) => {
+                // exactly one of: amb blu brn gry grn hzl oth.
+                let valid_values = vec!["amb", "blu", "brn", "gry", "grn", "hzl", "oth"];
+                valid_values.contains(&value)
+            }
+            (Some(value), EntryType::Pid) => {
+                // a nine-digit number, including leading zeroes.
+                // probably ok if we deal only with ascii right ?
+                value.as_bytes().len() == 9 && str::parse::<i64>(value).is_ok()
+            }
+            (_, EntryType::Cid) => {
+                // ignored, missing or not
+                true
+            }
+            _ => false
+        }
+    }
+}
+
+#[derive(Debug)]
+struct Passport<'a> {
+    fields: HashMap<EntryType, Option<&'a str>>
+}
+
+impl<'a> Passport<'a> {
+    fn new() -> Self {
+        let mut res = Self {
+            fields: HashMap::new()
+        };
+        res.fields.insert(EntryType::Byr, None);
+        res.fields.insert(EntryType::Iyr, None);
+        res.fields.insert(EntryType::Eyr, None);
+        res.fields.insert(EntryType::Hgt, None);
+        res.fields.insert(EntryType::Hcl, None);
+        res.fields.insert(EntryType::Ecl, None);
+        res.fields.insert(EntryType::Pid, None);
+        res.fields.insert(EntryType::Cid, None);
+        res
+    }
+    fn parse(&mut self, s: &'static str) {
+        for entry_s in s.split(&[' ', '\n'][..]) {
+            let mut tokens = entry_s.split(':');
+            if let Ok(etype) = EntryType::from_str(tokens.next().unwrap()) {
+                self.fields.insert(etype, tokens.next());
+            }
+        }
+    }
+    
+    fn is_valid_legacy(&self, mandatory_cid: bool) -> bool {
+        self.fields.iter().all(|(key, value)| {
+            (!mandatory_cid && *key == EntryType::Cid) ||
+                *value != None
+        })
+    }
+
+    fn is_valid(&self) -> bool {
+        self.fields.iter().all(|(key, value)| {
+            key.is_valid(value)
+        })
+    }
+}
+
+fn main() {
+    let data = include_str!("../data/input.txt");
+    // eprintln!("data = {}", data);
+    //eprintln!("data.split() = {:?}", data.split("\n\n").collect::<Vec<&str>>());
+    let passports: Vec<Passport> = data.split("\n\n").map(|pass_str| {
+        let mut res = Passport::new();
+        res.parse(pass_str);
+        res
+    }).collect();
+    // eprintln!("passports = {:#?}", passports);
+    // eprintln!("passports.size() = {:#?}", passports.len());
+    let nb_valid = passports.iter().filter(|p| (*p).is_valid_legacy(false)).count();
+    eprintln!("nb_valid = {:#?}", nb_valid);
+    let nb_valid_secondpass = passports.iter().filter(|p| p.is_valid()).count();
+    eprintln!("nb_valid_secondpass = {:#?}", nb_valid_secondpass);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_validation() {
+        let mut pass = Passport::new();
+        pass.parse("cid:271 pid:009457684 hcl:#80fab0\nbyr:1999 ecl:blu\niyr:2015\neyr:2029 hgt:159cm");
+        eprintln!("pass = {:#?}", pass);
+        assert_eq!(pass.is_valid(), true)
+    }
+}
\ No newline at end of file
diff --git a/5-binary_boarding/.gitignore b/5-binary_boarding/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/5-binary_boarding/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/5-binary_boarding/Cargo.lock b/5-binary_boarding/Cargo.lock
new file mode 100644
index 0000000..c49676c
--- /dev/null
+++ b/5-binary_boarding/Cargo.lock
@@ -0,0 +1,70 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "anyhow"
+version = "1.0.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68803225a7b13e47191bab76f2687382b60d259e8cf37f6e1893658b84bb9479"
+
+[[package]]
+name = "binary_boarding"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "thiserror",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "991431c3519a3f36861882da93630ce66b52918dcf1b8e2fd66b397fc96f28df"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.55"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a571a711dddd09019ccc628e1b17fe87c59b09d513c06c026877aa708334f37a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e9ae34b84616eedaaf1e9dd6026dbe00dcafa92aa0c8077cb69df1fcfe5e53e"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ba20f23e85b10754cd195504aebf6a27e2e6cbe28c17778a0c930724628dd56"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
diff --git a/5-binary_boarding/Cargo.toml b/5-binary_boarding/Cargo.toml
new file mode 100644
index 0000000..31c31c8
--- /dev/null
+++ b/5-binary_boarding/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "binary_boarding"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.36"
+thiserror = "1.0.22"
diff --git a/5-binary_boarding/data/input.txt b/5-binary_boarding/data/input.txt
new file mode 100644
index 0000000..cfb1d3b
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+FBFFFFFRRR
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+BBFFBBBLLR
+BBBFFBFLRL
+BBFFFBFLRR
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+FFBFBBFLLR
+BBFFFFFRLL
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+FFFBFFBRRR
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diff --git a/5-binary_boarding/src/main.rs b/5-binary_boarding/src/main.rs
new file mode 100644
index 0000000..d065d2d
--- /dev/null
+++ b/5-binary_boarding/src/main.rs
@@ -0,0 +1,82 @@
+use std::convert::TryFrom;
+use std::str::FromStr;
+use anyhow::Result;
+
+struct Plane {
+    cols: usize,
+    rows: usize,
+}
+const my_plane: Plane = Plane { cols: 8, rows: 128};
+
+#[derive(Debug, thiserror::Error, PartialEq)]
+enum ParseError {
+    #[error("Expected {0}")]
+    Expected(&'static str),
+}
+
+#[derive(Debug, PartialEq)]
+struct Seat {
+    col: usize,
+    row: usize,
+}
+
+impl FromStr for Seat {
+    type Err = ParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        if s.len() != 10 { return Err(ParseError::Expected("10-char string")) }
+
+        // split_at not supposed to fail as we are only working with ASCII chars here
+        let s_bit = s
+            .replace("F", "0")
+            .replace("B", "1")
+            .replace("R","1")
+            .replace("L", "0")
+            .chars()
+            .collect::<String>();
+        let (rowcode, colcode) = s_bit.split_at(7);
+        Ok(Self {
+            row: usize::from_str_radix(&rowcode, 2).unwrap(),
+            col: usize::from_str_radix(&colcode, 2).unwrap(),
+        })
+    }
+}
+
+impl Seat {
+    fn seat_id(&self) -> usize {
+        8 * self.row + self.col
+    }
+}
+
+fn main() {
+    let input = include_str!("../data/input.txt");
+    let mut seat_ids: Vec<usize> = input.lines().map(|l| Seat::from_str(l).unwrap().seat_id()).collect();
+    seat_ids.sort();
+    println!("Max seat id: {:?}", seat_ids.iter().max());
+    let banana = seat_ids
+        .windows(2)
+        .flat_map(<&[usize;2]>::try_from) // Because windows() makes no promise on slice size 
+        .find(|[a, b]| *b == *a + 2);
+    eprintln!("banana = {:#?}", banana);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    const AOC_INPUT: &str = "FBFBBFFRLR";
+    #[test]
+    fn test_build_seat() {
+        assert_eq!(
+            Seat::from_str(AOC_INPUT),
+            Ok(Seat { row: 44, col: 5 })
+        );
+    }
+
+    #[test]
+    fn test_seat_id() {
+        assert_eq!(
+            Seat::from_str(AOC_INPUT).unwrap().seat_id(),
+            357
+        );
+    }
+}
\ No newline at end of file
diff --git a/6-custom_customs/.gitignore b/6-custom_customs/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/6-custom_customs/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/6-custom_customs/Cargo.lock b/6-custom_customs/Cargo.lock
new file mode 100644
index 0000000..174b177
--- /dev/null
+++ b/6-custom_customs/Cargo.lock
@@ -0,0 +1,23 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "custom_customs"
+version = "0.1.0"
+dependencies = [
+ "itertools",
+]
+
+[[package]]
+name = "either"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
+
+[[package]]
+name = "itertools"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "284f18f85651fe11e8a991b2adb42cb078325c996ed026d994719efcfca1d54b"
+dependencies = [
+ "either",
+]
diff --git a/6-custom_customs/Cargo.toml b/6-custom_customs/Cargo.toml
new file mode 100644
index 0000000..be6f05a
--- /dev/null
+++ b/6-custom_customs/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "custom_customs"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+itertools = "0.9.0"
diff --git a/6-custom_customs/data/input.txt b/6-custom_customs/data/input.txt
new file mode 100644
index 0000000..1784e14
--- /dev/null
+++ b/6-custom_customs/data/input.txt
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diff --git a/6-custom_customs/element b/6-custom_customs/element
new file mode 100644
index 0000000..4823e2f
--- /dev/null
+++ b/6-custom_customs/element
@@ -0,0 +1 @@
+E: You must give at least one search pattern
diff --git a/6-custom_customs/riot b/6-custom_customs/riot
new file mode 100644
index 0000000..4823e2f
--- /dev/null
+++ b/6-custom_customs/riot
@@ -0,0 +1 @@
+E: You must give at least one search pattern
diff --git a/6-custom_customs/src/main.rs b/6-custom_customs/src/main.rs
new file mode 100644
index 0000000..684a14d
--- /dev/null
+++ b/6-custom_customs/src/main.rs
@@ -0,0 +1,81 @@
+use std::{collections::HashSet, todo};
+
+use itertools::Itertools;
+
+fn count_scores(input: &str) -> Vec<usize> {
+    input
+        .split("\n\n")
+        .map(|l| l.chars()
+                       .unique()
+                       .filter(|&c| c != '\n')
+                       .count())
+        .collect()
+}
+
+fn count_scores_v2(input: &str) -> Vec<usize> {
+    input
+    .split("\n\n")
+    .map(|group| {
+        group
+            .lines()
+            .map(|l| l.chars().collect::<HashSet<char>>())
+            .fold1(|acc: HashSet<char>, hset| {
+                acc.intersection(&hset).cloned().collect()
+            })
+            .unwrap()
+            .len()
+    })
+    .collect()
+}
+
+fn main() {
+    let input = include_str!("../data/input.txt");
+    let scores = count_scores(input);
+    println!("Sum of scores : {}", scores.iter().sum::<usize>());
+    println!("Sum of scores v2 : {}", count_scores_v2(input).iter().sum::<usize>())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_count_scores() {
+        let input = r#"abc
+
+a
+b
+c
+
+ab
+ac
+
+a
+a
+a
+a
+
+b"#;
+        assert_eq!(count_scores(input).iter().sum::<usize>(), 11)
+    }
+
+    #[test]
+    fn test_count_scores_v2() {
+        let input = r#"abc
+
+a
+b
+c
+
+ab
+ac
+
+a
+a
+a
+a
+
+b"#;
+        assert_eq!(count_scores_v2(input).iter().sum::<usize>(), 6);
+    }
+}
\ No newline at end of file
diff --git a/7-handy_haversacs/.gitignore b/7-handy_haversacs/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/7-handy_haversacs/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/7-handy_haversacs/Cargo.lock b/7-handy_haversacs/Cargo.lock
new file mode 100644
index 0000000..e126dee
--- /dev/null
+++ b/7-handy_haversacs/Cargo.lock
@@ -0,0 +1,75 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "handy_haversacs"
+version = "0.1.0"
+dependencies = [
+ "multimap",
+ "peg",
+]
+
+[[package]]
+name = "multimap"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1255076139a83bb467426e7f8d0134968a8118844faa755985e077cf31850333"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "peg"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f76678828272f177ac33b7e2ac2e3e73cc6c1cd1e3e387928aa69562fa51367"
+dependencies = [
+ "peg-macros",
+ "peg-runtime",
+]
+
+[[package]]
+name = "peg-macros"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "636d60acf97633e48d266d7415a9355d4389cea327a193f87df395d88cd2b14d"
+dependencies = [
+ "peg-runtime",
+ "proc-macro2",
+ "quote",
+]
+
+[[package]]
+name = "peg-runtime"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9555b1514d2d99d78150d3c799d4c357a3e2c2a8062cd108e93a06d9057629c5"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "991431c3519a3f36861882da93630ce66b52918dcf1b8e2fd66b397fc96f28df"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "serde"
+version = "1.0.118"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06c64263859d87aa2eb554587e2d23183398d617427327cf2b3d0ed8c69e4800"
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
diff --git a/7-handy_haversacs/Cargo.toml b/7-handy_haversacs/Cargo.toml
new file mode 100644
index 0000000..5b8f39f
--- /dev/null
+++ b/7-handy_haversacs/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "handy_haversacs"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+multimap = "0.8.2"
+peg = "0.6.3"
diff --git a/7-handy_haversacs/data/input b/7-handy_haversacs/data/input
new file mode 100644
index 0000000..b83432f
--- /dev/null
+++ b/7-handy_haversacs/data/input
@@ -0,0 +1,594 @@
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+dark gold bags contain 1 mirrored plum bag, 2 dark tomato bags, 5 dull green bags, 2 light lime bags.
+mirrored lavender bags contain 5 muted brown bags, 1 shiny blue bag, 5 dull blue bags, 3 wavy indigo bags.
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+vibrant turquoise bags contain 2 muted chartreuse bags, 2 clear magenta bags, 5 drab chartreuse bags.
+mirrored magenta bags contain 1 dull lime bag.
+mirrored violet bags contain 2 posh magenta bags, 1 plaid white bag, 4 wavy turquoise bags, 5 dull salmon bags.
+pale tomato bags contain 4 wavy maroon bags, 3 clear aqua bags, 2 striped lavender bags.
+clear fuchsia bags contain 5 dark cyan bags, 1 plaid cyan bag.
+drab orange bags contain 3 mirrored purple bags, 1 striped orange bag.
+bright blue bags contain 1 bright cyan bag, 4 plaid green bags.
+muted chartreuse bags contain 4 faded beige bags, 3 faded green bags.
+plaid teal bags contain 2 mirrored orange bags, 5 plaid plum bags.
+light blue bags contain 4 faded silver bags, 3 light turquoise bags, 2 dim aqua bags, 5 posh silver bags.
+bright tan bags contain 4 striped coral bags, 1 dark fuchsia bag.
+shiny black bags contain 1 light green bag.
+plaid violet bags contain 1 faded magenta bag, 1 shiny bronze bag, 2 vibrant tomato bags.
+posh bronze bags contain 4 shiny gold bags, 1 bright yellow bag, 1 dull cyan bag.
+light red bags contain 3 dotted black bags, 5 pale coral bags.
+striped red bags contain no other bags.
+clear tan bags contain 2 faded brown bags, 1 bright brown bag, 2 bright gold bags.
+dull turquoise bags contain 5 mirrored yellow bags, 3 wavy red bags, 5 faded purple bags, 4 clear green bags.
+plaid yellow bags contain 4 dark red bags, 3 dull tomato bags, 5 faded violet bags.
+dotted gold bags contain 2 dotted lime bags, 2 faded gray bags, 3 clear coral bags.
+dull bronze bags contain 2 pale red bags, 3 dim indigo bags.
+shiny green bags contain 2 pale red bags, 1 mirrored silver bag, 4 bright lime bags, 5 pale indigo bags.
+bright black bags contain 2 striped plum bags, 1 clear black bag, 4 clear olive bags.
+bright gold bags contain 3 wavy cyan bags, 1 dotted magenta bag, 1 muted salmon bag, 4 light maroon bags.
+muted violet bags contain 5 wavy cyan bags, 4 dim tan bags, 1 posh gray bag, 5 vibrant brown bags.
+dim turquoise bags contain 1 pale tomato bag, 2 dotted silver bags, 5 mirrored coral bags.
+drab lime bags contain 5 shiny gold bags.
+wavy bronze bags contain 1 shiny red bag, 4 dotted cyan bags.
+vibrant purple bags contain 4 drab chartreuse bags, 4 dotted yellow bags.
+plaid purple bags contain 2 drab beige bags, 3 pale aqua bags, 3 muted magenta bags.
+faded brown bags contain 3 faded beige bags, 1 light chartreuse bag, 4 mirrored gold bags.
+pale lavender bags contain 1 mirrored tomato bag, 5 wavy maroon bags, 4 wavy lime bags.
+posh fuchsia bags contain 5 posh orange bags.
+drab fuchsia bags contain 1 dim plum bag, 1 dark coral bag, 3 dark red bags.
+striped crimson bags contain 5 pale orange bags, 5 faded beige bags, 5 faded brown bags.
+wavy lime bags contain 5 dull crimson bags.
+vibrant fuchsia bags contain 2 wavy white bags.
+vibrant plum bags contain 4 dim salmon bags, 2 plaid tan bags, 3 dull blue bags.
+muted cyan bags contain 3 striped beige bags.
+clear teal bags contain 2 wavy aqua bags, 3 dotted plum bags.
+dark maroon bags contain 1 light violet bag, 3 clear plum bags, 5 dotted fuchsia bags, 2 vibrant tomato bags.
+dull black bags contain 5 muted olive bags.
+light yellow bags contain 1 dull white bag, 5 dark aqua bags, 3 light purple bags, 4 dim green bags.
+pale bronze bags contain 1 wavy aqua bag.
+plaid red bags contain 5 pale plum bags, 2 muted brown bags, 2 dull bronze bags.
+dim gray bags contain 2 muted lavender bags.
+plaid gray bags contain 5 muted aqua bags.
+vibrant blue bags contain 4 light tomato bags, 1 plaid beige bag.
+clear blue bags contain 5 clear plum bags, 5 drab chartreuse bags.
+dotted green bags contain 5 plaid white bags, 5 vibrant turquoise bags, 1 drab silver bag.
+dull crimson bags contain 3 mirrored yellow bags, 3 posh red bags, 3 faded brown bags.
+striped maroon bags contain 1 shiny magenta bag, 2 light brown bags, 4 dull green bags.
+dark yellow bags contain 4 faded silver bags, 5 shiny lavender bags, 4 dim crimson bags, 2 plaid bronze bags.
+pale indigo bags contain 4 plaid salmon bags, 3 striped purple bags, 5 pale magenta bags, 1 dotted lime bag.
+faded maroon bags contain 5 light silver bags, 5 dim bronze bags, 4 faded tan bags, 5 striped crimson bags.
+pale green bags contain 4 vibrant white bags.
+muted maroon bags contain 2 light black bags, 2 mirrored fuchsia bags.
+pale yellow bags contain 2 dull bronze bags, 4 bright maroon bags, 5 wavy cyan bags, 4 dotted lavender bags.
+posh white bags contain 3 mirrored turquoise bags, 3 shiny aqua bags, 2 striped blue bags, 4 faded coral bags.
+wavy orange bags contain 4 wavy crimson bags, 2 bright brown bags, 3 bright magenta bags, 1 dotted gold bag.
+dark beige bags contain 3 muted white bags.
+dotted salmon bags contain 5 dim bronze bags, 5 striped orange bags.
+dotted fuchsia bags contain 1 striped red bag, 4 bright purple bags.
+pale cyan bags contain 1 dull blue bag.
+mirrored purple bags contain 5 light turquoise bags, 2 faded silver bags.
+drab violet bags contain 1 vibrant turquoise bag, 2 muted chartreuse bags, 5 pale bronze bags.
+wavy gray bags contain 1 dark purple bag, 4 muted green bags.
+wavy magenta bags contain 5 dark white bags, 4 vibrant black bags, 4 muted coral bags.
+pale plum bags contain 5 mirrored brown bags, 2 pale red bags.
+light plum bags contain 4 dark tomato bags, 4 wavy gold bags.
+pale aqua bags contain 1 striped red bag, 2 dim crimson bags, 3 mirrored orange bags.
+muted green bags contain 1 mirrored yellow bag.
+bright purple bags contain 5 light violet bags, 5 clear magenta bags, 1 faded lime bag.
+dark green bags contain 2 shiny aqua bags.
+dark orange bags contain 3 striped coral bags.
+dotted chartreuse bags contain 1 bright lime bag, 1 light olive bag, 4 muted red bags, 1 posh chartreuse bag.
+shiny chartreuse bags contain 1 bright salmon bag, 1 plaid indigo bag.
+clear gold bags contain 5 dull lime bags, 4 shiny brown bags, 1 dull plum bag, 4 dull salmon bags.
+shiny salmon bags contain 2 muted salmon bags, 2 dotted lavender bags.
+striped cyan bags contain 3 drab tan bags, 5 dotted cyan bags, 1 posh aqua bag, 1 plaid magenta bag.
+dark plum bags contain 1 clear orange bag, 2 striped black bags.
+vibrant magenta bags contain 1 plaid tan bag, 3 muted bronze bags, 3 bright chartreuse bags.
+clear beige bags contain 4 muted tan bags, 1 clear turquoise bag, 4 mirrored turquoise bags, 2 bright silver bags.
+drab lavender bags contain 1 dotted cyan bag, 4 clear plum bags.
+shiny coral bags contain 2 drab beige bags.
+light bronze bags contain 2 mirrored plum bags, 2 light black bags.
+vibrant yellow bags contain 4 vibrant coral bags, 5 mirrored olive bags, 1 light lime bag, 2 muted crimson bags.
+vibrant salmon bags contain 4 faded beige bags, 2 faded olive bags, 1 pale brown bag.
+dim tan bags contain 3 faded beige bags, 4 light tan bags.
+vibrant silver bags contain 1 dark tomato bag.
+striped salmon bags contain 5 faded brown bags.
+shiny purple bags contain 1 pale lavender bag, 3 plaid black bags, 1 drab indigo bag.
+light turquoise bags contain 4 dark silver bags.
+dark chartreuse bags contain 5 dark silver bags.
+mirrored indigo bags contain 5 mirrored gold bags, 1 dotted white bag.
+faded olive bags contain 1 pale brown bag, 3 faded beige bags, 2 light chartreuse bags.
+mirrored black bags contain 5 posh purple bags.
+clear green bags contain 2 dark magenta bags, 5 faded gold bags, 4 striped teal bags, 4 dark purple bags.
+bright beige bags contain 3 light olive bags, 3 wavy orange bags, 4 dotted lavender bags.
+plaid brown bags contain 4 dull lavender bags, 3 drab gold bags.
+vibrant chartreuse bags contain 1 bright bronze bag, 5 wavy crimson bags.
+posh aqua bags contain 5 muted green bags, 2 dim green bags, 1 dim crimson bag, 1 posh red bag.
+vibrant gold bags contain 5 wavy chartreuse bags, 3 drab gold bags, 2 striped blue bags, 3 posh yellow bags.
+posh tan bags contain 1 shiny chartreuse bag, 2 drab bronze bags.
+bright violet bags contain 1 pale lavender bag, 5 mirrored olive bags, 1 posh turquoise bag.
+faded lime bags contain 5 pale brown bags, 4 faded black bags, 1 faded beige bag.
+vibrant gray bags contain 3 vibrant chartreuse bags, 3 bright purple bags.
+dull silver bags contain 5 pale tomato bags, 5 shiny turquoise bags, 2 mirrored yellow bags.
+pale maroon bags contain 3 posh red bags, 1 plaid bronze bag, 5 striped red bags.
+dull lavender bags contain 4 vibrant violet bags, 1 bright yellow bag, 3 bright aqua bags.
+light aqua bags contain 5 vibrant turquoise bags.
+striped violet bags contain 4 drab silver bags, 3 posh magenta bags, 3 wavy turquoise bags.
+bright green bags contain 3 drab teal bags.
+light coral bags contain 5 dotted violet bags, 4 pale chartreuse bags.
+muted salmon bags contain 4 vibrant turquoise bags, 5 clear chartreuse bags, 1 dark fuchsia bag, 5 bright bronze bags.
+wavy cyan bags contain 4 dim orange bags, 1 dull orange bag, 4 plaid indigo bags, 4 dim salmon bags.
+shiny red bags contain 1 dim blue bag, 4 clear plum bags.
+vibrant beige bags contain 3 posh red bags.
+shiny maroon bags contain 3 striped tomato bags, 2 faded lime bags.
+shiny aqua bags contain 3 bright yellow bags.
+bright aqua bags contain 5 wavy lavender bags, 4 striped coral bags, 5 dotted cyan bags, 3 drab cyan bags.
+dim olive bags contain 2 posh blue bags, 5 vibrant violet bags, 3 drab brown bags, 1 dull purple bag.
+shiny silver bags contain 5 dim green bags, 4 dull cyan bags.
+dim brown bags contain 1 wavy brown bag, 3 drab black bags.
+dotted brown bags contain 3 drab crimson bags, 1 shiny red bag.
+striped coral bags contain 4 striped red bags, 1 dotted cyan bag.
+dotted plum bags contain 3 faded lime bags, 2 striped lavender bags, 2 wavy crimson bags, 2 faded brown bags.
+light gold bags contain 1 light silver bag, 3 posh teal bags, 3 dark orange bags, 4 bright bronze bags.
+dark tan bags contain 5 drab black bags, 2 plaid cyan bags, 3 faded yellow bags, 1 dim blue bag.
+posh olive bags contain 4 drab olive bags, 5 dull tan bags, 1 wavy chartreuse bag, 5 muted magenta bags.
+dull red bags contain 1 vibrant teal bag, 4 dim salmon bags, 1 bright violet bag, 1 dark lavender bag.
+plaid turquoise bags contain 3 faded green bags, 5 wavy crimson bags.
+plaid cyan bags contain 2 dull yellow bags, 2 dotted cyan bags, 1 light chartreuse bag, 2 faded green bags.
+dull indigo bags contain 2 faded silver bags.
+pale brown bags contain no other bags.
+striped plum bags contain 5 dull lime bags, 2 muted white bags, 3 striped teal bags.
+dotted coral bags contain 4 faded silver bags, 2 wavy aqua bags, 2 light chartreuse bags, 5 posh indigo bags.
+mirrored beige bags contain 1 plaid black bag, 2 plaid tan bags, 2 pale bronze bags.
+vibrant cyan bags contain 4 wavy beige bags, 1 shiny orange bag.
+wavy fuchsia bags contain 5 pale maroon bags, 3 drab violet bags, 2 shiny orange bags.
+drab silver bags contain 2 dark blue bags, 3 light chartreuse bags, 3 mirrored gold bags.
+wavy turquoise bags contain 5 posh red bags, 4 striped teal bags.
+bright cyan bags contain 4 bright silver bags, 1 muted gray bag, 5 faded aqua bags, 3 wavy aqua bags.
+wavy green bags contain 4 clear violet bags, 4 dark olive bags, 2 clear magenta bags, 1 mirrored black bag.
+mirrored gold bags contain 2 dark olive bags.
+wavy gold bags contain 4 plaid indigo bags.
+dotted yellow bags contain 3 dull orange bags, 2 faded green bags.
+light beige bags contain 4 dull cyan bags.
+bright crimson bags contain 1 faded tan bag, 1 faded chartreuse bag, 5 vibrant brown bags.
+dotted bronze bags contain 5 striped white bags.
+mirrored yellow bags contain 3 wavy crimson bags, 4 dark olive bags, 5 drab tan bags.
+plaid lavender bags contain 1 light tomato bag, 5 dull blue bags, 2 wavy indigo bags, 3 bright gray bags.
+drab purple bags contain 3 dotted plum bags, 5 drab olive bags, 1 drab tan bag, 3 dark black bags.
+shiny lime bags contain 2 plaid bronze bags, 1 shiny gold bag.
+drab chartreuse bags contain 2 bright bronze bags, 4 light teal bags, 1 mirrored yellow bag.
+bright plum bags contain 3 drab turquoise bags.
+light orange bags contain 1 shiny lavender bag, 2 dark fuchsia bags, 1 muted olive bag, 4 wavy olive bags.
+striped beige bags contain 4 dull crimson bags, 5 dotted fuchsia bags.
+wavy chartreuse bags contain 2 bright salmon bags, 5 faded green bags, 1 mirrored black bag.
+striped tomato bags contain no other bags.
+plaid aqua bags contain 1 light magenta bag, 3 pale white bags, 3 clear blue bags, 4 dull crimson bags.
+plaid tan bags contain 3 dull green bags, 1 light silver bag, 5 dim orange bags, 1 dark blue bag.
+dotted cyan bags contain 2 wavy black bags, 3 striped teal bags.
+dull green bags contain 1 plaid magenta bag, 3 dull plum bags, 4 dim green bags.
+faded purple bags contain 5 mirrored cyan bags, 1 dull beige bag, 4 vibrant purple bags.
+dotted maroon bags contain 1 vibrant beige bag, 3 plaid magenta bags.
+faded aqua bags contain 4 plaid gold bags, 1 plaid yellow bag, 2 bright lime bags.
+pale lime bags contain 1 light blue bag.
+dark indigo bags contain 1 light gold bag.
+shiny orange bags contain 2 plaid black bags, 2 faded brown bags, 4 plaid indigo bags.
+muted olive bags contain 1 wavy chartreuse bag.
+muted purple bags contain 4 dotted silver bags.
+plaid black bags contain 3 drab silver bags.
+striped lavender bags contain 5 wavy crimson bags.
+posh chartreuse bags contain 5 drab chartreuse bags.
+clear purple bags contain 3 faded green bags, 2 bright gold bags.
+dark crimson bags contain 4 plaid teal bags, 4 muted cyan bags.
+clear silver bags contain 3 pale beige bags, 2 mirrored tomato bags.
+dotted indigo bags contain 2 dark plum bags, 2 clear magenta bags, 3 light olive bags.
+dull chartreuse bags contain 2 light turquoise bags, 3 drab brown bags.
+bright brown bags contain 4 light purple bags, 1 vibrant coral bag.
+dim salmon bags contain 2 dull salmon bags.
+muted lime bags contain 4 muted violet bags, 5 shiny white bags.
+vibrant lime bags contain 2 mirrored bronze bags, 1 dotted crimson bag, 5 dim yellow bags, 2 mirrored gold bags.
+muted silver bags contain 1 striped orange bag, 3 drab purple bags.
+mirrored bronze bags contain 4 dull bronze bags.
+light olive bags contain 4 mirrored olive bags, 2 dim lime bags, 1 clear magenta bag.
+vibrant tan bags contain 2 shiny teal bags.
+posh red bags contain 2 bright bronze bags, 5 striped teal bags, 5 faded beige bags, 4 faded olive bags.
+faded red bags contain 4 striped lavender bags, 4 posh red bags.
+mirrored brown bags contain 3 dim salmon bags, 4 drab chartreuse bags, 1 wavy tomato bag.
+dark gray bags contain 1 muted tan bag, 4 faded blue bags, 2 dim chartreuse bags.
+dark white bags contain 4 vibrant lime bags, 4 pale olive bags.
+striped silver bags contain 4 dim cyan bags.
+clear salmon bags contain 5 pale magenta bags, 1 mirrored salmon bag.
+pale white bags contain 5 wavy crimson bags, 4 plaid indigo bags, 5 striped crimson bags, 3 drab violet bags.
+vibrant indigo bags contain 1 mirrored gold bag, 1 striped turquoise bag, 3 posh beige bags.
+drab aqua bags contain 5 faded crimson bags, 3 wavy gold bags, 3 striped tomato bags.
+clear brown bags contain 5 bright lavender bags.
+posh indigo bags contain 5 mirrored red bags, 5 clear coral bags.
+posh black bags contain 4 dim fuchsia bags, 5 muted olive bags, 3 mirrored red bags.
+shiny lavender bags contain 2 muted aqua bags, 3 striped black bags, 3 wavy salmon bags, 3 mirrored purple bags.
+vibrant bronze bags contain 1 bright tan bag, 5 faded beige bags, 5 pale red bags, 1 plaid cyan bag.
+clear chartreuse bags contain 2 shiny gold bags, 1 wavy turquoise bag, 2 muted crimson bags.
+drab tan bags contain no other bags.
+posh gold bags contain 5 dotted beige bags, 1 striped crimson bag, 5 drab purple bags, 1 bright gray bag.
+clear olive bags contain 3 dark tomato bags.
+dim aqua bags contain 4 wavy black bags, 5 clear chartreuse bags, 5 clear aqua bags.
+pale coral bags contain 2 shiny orange bags, 5 dark black bags, 3 vibrant coral bags.
+drab blue bags contain 5 dull salmon bags.
+vibrant white bags contain 2 mirrored yellow bags.
+faded indigo bags contain 5 clear aqua bags.
+posh turquoise bags contain 1 light purple bag, 4 mirrored salmon bags.
+dotted orange bags contain 5 dark blue bags, 1 shiny lavender bag, 2 dim plum bags, 3 clear violet bags.
+muted crimson bags contain 4 wavy crimson bags, 1 light magenta bag, 3 clear plum bags.
+dim coral bags contain 1 vibrant red bag, 2 vibrant magenta bags.
+mirrored plum bags contain 5 light olive bags.
+dull violet bags contain 2 dim aqua bags.
+faded violet bags contain 5 clear violet bags, 5 muted indigo bags, 3 clear red bags, 1 posh tan bag.
+vibrant crimson bags contain 1 shiny crimson bag.
+muted plum bags contain 3 drab beige bags, 4 posh maroon bags.
+dim orange bags contain 5 bright salmon bags.
+dim blue bags contain 1 mirrored black bag, 3 faded blue bags.
+mirrored tan bags contain 5 plaid plum bags.
+pale crimson bags contain 4 dim green bags, 2 pale fuchsia bags.
+bright white bags contain 2 drab gold bags, 2 shiny maroon bags, 5 mirrored lime bags.
+dim indigo bags contain 1 mirrored cyan bag, 1 wavy purple bag, 1 drab brown bag.
+dotted violet bags contain 4 bright teal bags, 2 vibrant plum bags.
+wavy indigo bags contain 2 drab silver bags, 1 muted chartreuse bag, 1 drab aqua bag, 3 mirrored teal bags.
+dark cyan bags contain 1 muted magenta bag, 3 vibrant violet bags, 4 mirrored aqua bags, 5 drab violet bags.
+posh maroon bags contain 5 muted chartreuse bags, 4 dark olive bags.
+drab tomato bags contain 2 plaid tan bags, 2 posh purple bags, 2 posh beige bags.
+wavy tan bags contain 5 light cyan bags, 5 muted brown bags, 5 mirrored coral bags, 5 light chartreuse bags.
+faded bronze bags contain 4 dotted magenta bags.
+pale blue bags contain 5 pale purple bags.
+dim magenta bags contain 5 posh aqua bags, 5 dim crimson bags, 4 wavy gold bags, 2 shiny orange bags.
+dark fuchsia bags contain 2 drab silver bags.
+wavy white bags contain 4 vibrant turquoise bags, 2 clear violet bags, 1 dull salmon bag.
+drab maroon bags contain 3 pale tomato bags, 2 dim chartreuse bags, 5 mirrored orange bags, 4 drab violet bags.
+muted fuchsia bags contain 4 muted bronze bags, 4 plaid brown bags, 1 faded white bag.
+plaid gold bags contain 3 vibrant bronze bags, 5 striped chartreuse bags.
+faded green bags contain 2 dull cyan bags, 5 posh purple bags.
+light indigo bags contain 5 mirrored tomato bags.
+striped white bags contain 5 clear plum bags.
+posh magenta bags contain 5 wavy crimson bags, 3 striped coral bags.
+drab olive bags contain 4 striped orange bags.
+plaid indigo bags contain 1 plaid turquoise bag.
+dark brown bags contain 2 faded tan bags, 5 wavy green bags.
+faded cyan bags contain 2 bright violet bags, 3 mirrored salmon bags.
+dim lavender bags contain 2 mirrored fuchsia bags, 3 pale magenta bags, 2 dotted tan bags, 4 posh bronze bags.
+dull maroon bags contain 3 dark silver bags, 5 dim plum bags.
+dull teal bags contain 3 pale green bags.
+shiny yellow bags contain 4 dotted fuchsia bags.
+mirrored crimson bags contain 5 dotted plum bags.
+drab beige bags contain 3 faded orange bags, 3 dark orange bags, 4 clear orange bags.
+dull olive bags contain 2 vibrant bronze bags, 4 shiny chartreuse bags.
+wavy red bags contain 2 wavy brown bags, 1 wavy olive bag, 3 striped cyan bags.
+light gray bags contain 1 pale salmon bag, 2 plaid bronze bags, 5 dull yellow bags.
+faded gray bags contain 4 muted green bags, 5 faded red bags, 3 muted magenta bags, 5 bright magenta bags.
+drab indigo bags contain 1 posh gold bag, 2 dull lime bags, 1 pale orange bag.
+bright yellow bags contain 4 posh red bags, 4 shiny gold bags.
+drab bronze bags contain 4 dark indigo bags.
+striped gold bags contain 3 faded yellow bags, 2 mirrored tomato bags, 1 bright lime bag.
+muted gold bags contain 4 dim violet bags.
+plaid olive bags contain 3 wavy fuchsia bags.
+bright gray bags contain 4 bright bronze bags, 1 plaid white bag, 1 pale bronze bag.
+clear turquoise bags contain 2 mirrored purple bags, 2 light gold bags, 4 dim cyan bags, 5 wavy olive bags.
+wavy plum bags contain 4 bright yellow bags.
+dull blue bags contain 4 dotted lavender bags.
+posh gray bags contain 4 faded blue bags, 2 dull brown bags, 1 clear cyan bag.
+pale black bags contain 5 dim cyan bags, 4 bright white bags.
+wavy blue bags contain 3 faded olive bags, 5 bright lavender bags, 1 wavy black bag, 2 posh magenta bags.
+posh beige bags contain 2 light cyan bags, 1 wavy violet bag, 1 muted olive bag.
+clear plum bags contain 3 dull cyan bags.
+drab cyan bags contain 5 plaid green bags.
+vibrant aqua bags contain 5 posh maroon bags.
+dim silver bags contain 5 shiny gold bags, 5 posh magenta bags, 1 light white bag.
+posh brown bags contain 4 plaid salmon bags, 2 vibrant blue bags, 2 posh olive bags.
+dark teal bags contain 1 faded brown bag.
+clear white bags contain 5 vibrant tan bags, 5 light purple bags, 3 posh tan bags, 4 faded beige bags.
+dim maroon bags contain 2 plaid chartreuse bags, 1 dim gray bag, 2 drab gold bags, 5 light white bags.
+dull salmon bags contain 5 striped teal bags, 3 dark blue bags, 3 drab tan bags, 5 wavy crimson bags.
+dull coral bags contain 1 faded red bag, 2 shiny teal bags, 3 bright gray bags, 1 pale brown bag.
+dark violet bags contain 1 clear cyan bag, 4 mirrored beige bags, 2 vibrant turquoise bags.
+vibrant maroon bags contain 1 muted magenta bag, 3 muted olive bags, 2 shiny turquoise bags.
+posh orange bags contain 5 dark black bags, 3 pale maroon bags, 5 dull plum bags.
+clear indigo bags contain 4 faded tan bags, 3 clear orange bags, 1 vibrant aqua bag.
+clear gray bags contain 4 dull salmon bags, 5 dark magenta bags.
+shiny turquoise bags contain 4 muted green bags, 4 vibrant beige bags, 5 mirrored cyan bags, 4 striped blue bags.
+pale salmon bags contain 1 dark silver bag, 4 dim green bags.
+striped gray bags contain 3 dark lavender bags.
+dull yellow bags contain 2 dark blue bags, 4 striped tomato bags, 2 striped red bags, 3 pale brown bags.
+posh yellow bags contain 1 dull green bag, 1 dull plum bag.
+plaid white bags contain 3 plaid turquoise bags, 4 dotted cyan bags, 3 shiny gold bags, 5 clear plum bags.
+faded orange bags contain 1 dull silver bag, 4 clear gray bags, 1 posh tomato bag, 2 wavy yellow bags.
+dim violet bags contain 4 drab silver bags, 1 dull yellow bag, 3 faded blue bags.
+light green bags contain 3 drab gold bags, 4 wavy purple bags.
+dark magenta bags contain 2 light gold bags, 5 drab violet bags.
+dark purple bags contain 5 plaid beige bags.
+mirrored blue bags contain 2 plaid tan bags.
+dim lime bags contain 1 dotted beige bag, 2 striped white bags, 5 dim blue bags, 5 wavy blue bags.
+bright chartreuse bags contain 3 clear orange bags.
+vibrant brown bags contain 3 mirrored violet bags, 5 dull green bags, 2 pale magenta bags.
+drab salmon bags contain 4 muted magenta bags.
+muted teal bags contain 5 dark black bags, 5 light gold bags.
+striped lime bags contain 1 dim orange bag.
+plaid crimson bags contain 4 dim teal bags, 3 dull salmon bags.
+posh plum bags contain 5 pale gray bags.
+light maroon bags contain 4 drab violet bags, 2 faded brown bags, 2 striped black bags, 3 striped coral bags.
+pale gray bags contain 1 dark aqua bag, 3 mirrored tomato bags.
+light chartreuse bags contain no other bags.
+dim crimson bags contain 5 faded blue bags, 1 dark blue bag, 2 striped teal bags.
+dim beige bags contain 5 wavy silver bags, 1 wavy orange bag, 1 dim lime bag, 2 mirrored lime bags.
+bright teal bags contain 1 dull violet bag, 1 faded beige bag, 3 faded orange bags.
+striped green bags contain 2 drab gold bags, 5 posh olive bags, 4 light indigo bags, 1 clear yellow bag.
+striped black bags contain 4 striped crimson bags, 1 pale red bag.
+plaid beige bags contain 3 pale tomato bags.
+drab plum bags contain 4 striped coral bags, 3 dotted crimson bags.
+plaid orange bags contain 4 bright aqua bags.
+wavy maroon bags contain 1 dim orange bag, 1 dim violet bag, 4 posh chartreuse bags, 5 plaid tan bags.
+dim purple bags contain 1 mirrored black bag, 1 plaid plum bag, 4 striped teal bags, 1 posh aqua bag.
+mirrored red bags contain 2 shiny salmon bags, 3 bright salmon bags, 1 vibrant salmon bag.
+striped brown bags contain 3 light lime bags, 1 drab black bag, 2 dull white bags, 5 drab lavender bags.
+dim red bags contain 2 mirrored black bags.
+clear lavender bags contain 5 pale fuchsia bags.
+bright bronze bags contain 2 striped teal bags, 4 clear plum bags, 3 dim crimson bags, 5 faded black bags.
+shiny violet bags contain 2 dark gold bags, 3 posh maroon bags.
+bright lime bags contain 2 clear magenta bags, 3 dark blue bags, 4 striped lavender bags, 1 dull crimson bag.
+mirrored silver bags contain 1 vibrant tomato bag, 4 dull salmon bags, 5 plaid green bags, 4 wavy brown bags.
+dotted olive bags contain 5 faded beige bags.
+posh tomato bags contain 2 faded purple bags.
+posh teal bags contain 2 drab tan bags, 3 striped red bags, 3 dull salmon bags, 1 striped lavender bag.
+shiny tomato bags contain 3 posh indigo bags.
+dotted crimson bags contain 1 pale gray bag.
+shiny indigo bags contain 1 pale beige bag.
+plaid lime bags contain 1 light maroon bag.
+mirrored turquoise bags contain 5 faded bronze bags.
+drab crimson bags contain 1 vibrant plum bag.
+dim black bags contain 3 muted tan bags, 3 drab silver bags, 4 dull white bags.
+faded yellow bags contain 5 faded black bags.
+faded white bags contain 2 wavy lavender bags, 1 shiny orange bag.
+plaid tomato bags contain 2 shiny brown bags, 3 clear red bags.
+drab white bags contain 5 dark yellow bags.
+mirrored tomato bags contain 2 light gold bags, 1 mirrored gold bag, 4 dim plum bags.
+plaid maroon bags contain 2 mirrored lime bags, 3 plaid salmon bags, 2 shiny chartreuse bags.
+drab gold bags contain 1 dim plum bag, 2 mirrored violet bags.
+muted orange bags contain 3 mirrored lime bags, 1 muted maroon bag, 5 drab violet bags, 2 posh green bags.
+mirrored fuchsia bags contain 3 dim plum bags, 2 muted olive bags, 2 wavy white bags, 1 dotted cyan bag.
+plaid silver bags contain 3 pale violet bags, 5 striped purple bags, 5 dull purple bags.
+dotted silver bags contain 2 vibrant coral bags.
+shiny cyan bags contain 4 mirrored teal bags, 4 faded magenta bags, 4 bright lime bags, 1 vibrant teal bag.
+clear yellow bags contain 1 muted brown bag, 5 wavy lime bags.
+muted red bags contain 5 muted coral bags, 2 light violet bags, 2 muted indigo bags, 4 dotted tan bags.
+dull beige bags contain 5 plaid black bags, 2 pale white bags, 2 light violet bags, 1 pale crimson bag.
+vibrant lavender bags contain 3 dark chartreuse bags, 4 bright lavender bags.
+posh lime bags contain 1 shiny cyan bag, 4 dotted blue bags, 3 mirrored chartreuse bags.
+shiny blue bags contain 1 dotted magenta bag.
+muted yellow bags contain 4 plaid salmon bags, 4 dull tomato bags.
+muted blue bags contain 5 wavy magenta bags, 3 vibrant gray bags.
+dotted tan bags contain 1 wavy green bag, 1 dim plum bag.
+drab red bags contain 2 dark olive bags, 5 mirrored tan bags, 3 dull coral bags, 4 plaid yellow bags.
+dull tomato bags contain 2 clear aqua bags, 2 dark fuchsia bags, 2 light teal bags.
+bright salmon bags contain 5 dark blue bags.
+pale olive bags contain 1 light violet bag, 3 shiny bronze bags, 2 dotted magenta bags, 4 posh silver bags.
+mirrored teal bags contain 4 posh chartreuse bags, 5 vibrant bronze bags.
+mirrored chartreuse bags contain 3 striped olive bags, 3 mirrored maroon bags, 5 faded black bags, 3 pale plum bags.
+pale orange bags contain 4 mirrored gold bags, 3 faded brown bags, 2 dark olive bags.
+dark olive bags contain no other bags.
+faded plum bags contain 5 bright green bags, 5 shiny beige bags, 2 vibrant indigo bags, 1 mirrored orange bag.
+drab magenta bags contain 5 dark fuchsia bags, 5 striped salmon bags.
+dark lavender bags contain 5 mirrored red bags, 4 vibrant aqua bags, 2 dotted tan bags.
+shiny bronze bags contain 2 clear aqua bags, 2 dull salmon bags, 1 plaid turquoise bag, 3 plaid bronze bags.
+faded magenta bags contain 2 mirrored gold bags, 5 dim orange bags.
+light lavender bags contain 3 striped magenta bags, 5 light yellow bags.
+clear tomato bags contain 3 dark bronze bags, 5 plaid aqua bags, 2 faded lime bags, 2 bright salmon bags.
+clear lime bags contain 1 mirrored lavender bag, 3 bright silver bags, 3 pale teal bags.
+light lime bags contain 4 dim crimson bags, 2 vibrant tomato bags, 4 posh red bags.
+wavy yellow bags contain 3 muted chartreuse bags, 3 drab teal bags, 4 striped tomato bags.
+dark silver bags contain 5 posh magenta bags, 1 plaid black bag, 3 faded brown bags.
+bright maroon bags contain 5 dotted turquoise bags, 3 wavy silver bags, 2 dotted lime bags.
+striped orange bags contain 5 striped coral bags, 3 posh teal bags.
+bright silver bags contain 3 mirrored violet bags, 5 striped gold bags, 1 striped white bag, 4 clear chartreuse bags.
+mirrored olive bags contain 4 light silver bags, 1 muted crimson bag.
+dim gold bags contain 3 clear magenta bags.
+shiny plum bags contain 5 muted olive bags, 5 dark turquoise bags, 2 dull green bags, 1 plaid magenta bag.
+mirrored green bags contain 5 striped magenta bags, 1 light lime bag, 2 dim cyan bags.
+wavy aqua bags contain 4 dull tan bags, 5 vibrant beige bags.
+posh lavender bags contain 4 muted black bags.
+dull lime bags contain 2 plaid black bags.
+dim chartreuse bags contain 4 bright red bags.
+muted lavender bags contain 5 faded red bags, 5 drab brown bags, 5 clear bronze bags.
+muted coral bags contain 4 clear red bags, 3 vibrant maroon bags.
+bright lavender bags contain 4 striped blue bags.
diff --git a/7-handy_haversacs/src/main.rs b/7-handy_haversacs/src/main.rs
new file mode 100644
index 0000000..fcbd21e
--- /dev/null
+++ b/7-handy_haversacs/src/main.rs
@@ -0,0 +1,138 @@
+use std::fmt;
+
+use multimap::MultiMap;
+
+fn main() {
+    let input = include_str!("../data/input");
+    let rules = parse_rules(input);
+    print!("{}", FmtRules(rules.clone()));
+
+    let mut reverted_rules: Rules = Default::default();
+    rules.iter_all().for_each(|(container, contained)| {
+        for c in contained {
+            reverted_rules.insert(c.1, (1, *container));
+        }
+    });
+    // dbg!(reverted_rules.clone());
+
+    let shiny_gold_spec = ("shiny", "gold"); 
+    let mut shiny_gold_containers = find_containers(
+        &reverted_rules, 
+        &shiny_gold_spec
+    );
+    shiny_gold_containers.0.sort();
+    shiny_gold_containers.0.dedup();
+    // shiny_gold_containers also contain shiny_gold sadly...
+    dbg!(&shiny_gold_containers);
+    println!("Number of bags that can contain shiny gold ones : {}", shiny_gold_containers.0.len()-1);
+
+
+    //////// PART 2 /////////
+    let shiny_gold_contained = find_containers(&rules, &shiny_gold_spec);
+    // Remove 1 because the shiny gold bag actually doesn't contain itself ;)
+    println!("Number of bags contained by shiny gold bags : {}", shiny_gold_contained.1 - 1);
+}
+
+type BagSpec<'a> = (&'a str, &'a str);
+
+type Rules<'a> = MultiMap<BagSpec<'a>, (usize, BagSpec<'a>)>;
+// Needed as you cannot implement a trait for an abstract type if not in current mod...
+struct FmtRules<'a>(Rules<'a>);
+
+impl<'a> fmt::Display for FmtRules<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        for ((adjective,colour), rules) in self.0.iter_all() {
+            write!(f, "{} {} bags contain ", adjective, colour)?;
+            if rules.is_empty() {
+                write!(f, "no other bags.")?;
+            } else {
+                for (idx, (nb, (adj, colour))) in rules.iter().enumerate() {
+                    if idx > 0 { write!(f, ", ")? }
+                    write!(f, "{} {} {} {}", nb, adj, colour, if *nb > 1 { "bags" } else { "bag" })?;
+                }
+                writeln!(f, ".")?;
+            }
+        }
+        Ok(())
+    }
+}
+
+fn parse_rules(input: &str) -> Rules<'_> {
+    let mut rules: Rules = Default::default();
+
+    peg::parser! {
+        pub(crate) grammar parser() for str {
+            pub(crate) rule root(r: &mut Rules<'input>)
+                = (line(r) "." whitespace()*)* ![_]
+            
+            rule line(r: &mut Rules<'input>)
+                = bag:bag_spec() " contain " rules:rules() {
+                    if let Some(rules) = rules {
+                        for rule in rules {
+                            r.insert(bag, rule);
+                        }
+                    }
+                }
+
+            rule bag_spec() -> BagSpec<'input>
+                = adjective:name() " " colour:name() " bag" "s"? {
+                    (adjective, colour)
+                }
+            
+            rule rules() -> Option<Vec<(usize, BagSpec<'input>)>>
+                = rules:rules1()+ {Some(rules)}
+                  / "no other bags" { None }
+            
+            rule rules1() -> (usize, BagSpec<'input>)
+                = n:number() " " bag:bag_spec() ", "? {
+                    (n, bag)
+                }
+            
+            rule name() -> &'input str
+                = $((!whitespace()[_])+)
+            
+            rule number() -> usize
+                = n:$(['0'..='9']+) { n.parse().unwrap() }
+            
+            rule whitespace() = quiet!{[' ' | '\n' | '\t']+}
+        }
+    }
+
+    parser::root(input, &mut rules).unwrap();
+    rules
+}
+
+fn find_containers<'a>(rr: &'a Rules, start: &'a BagSpec) 
+        -> (Vec<BagSpec<'a>>, usize) {
+    let mut res = vec![*start];
+    let mut count = 0;
+    let containers = rr.get_vec(start);
+    
+    // for c in containers.iter().flat_map(|&v|v) {
+    for c  in containers.into_iter().flatten().collect::<Vec<&(usize, (&str, &str))>>() {
+        let mut b = find_containers(rr, &(c.1));
+        res.append(&mut b.0);
+        count += c.0 * b.1;
+    }
+    (res, count + 1)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_phase2() {
+        let input = r"shiny gold bags contain 2 dark red bags.
+dark red bags contain 2 dark orange bags.
+dark orange bags contain 2 dark yellow bags.
+dark yellow bags contain 2 dark green bags.
+dark green bags contain 2 dark blue bags.
+dark blue bags contain 2 dark violet bags.
+dark violet bags contain no other bags.";
+        let rules = parse_rules(input);
+        let shiny_gold_spec = ("shiny", "gold"); 
+        let shiny_gold_contained = find_containers(&rules, &shiny_gold_spec);
+        assert_eq!(shiny_gold_contained.1 - 1, 126);
+    }
+}
\ No newline at end of file
diff --git a/8-handheld_halting/.gitignore b/8-handheld_halting/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/8-handheld_halting/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/8-handheld_halting/Cargo.lock b/8-handheld_halting/Cargo.lock
new file mode 100644
index 0000000..ebf266f
--- /dev/null
+++ b/8-handheld_halting/Cargo.lock
@@ -0,0 +1,70 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "anyhow"
+version = "1.0.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee67c11feeac938fae061b232e38e0b6d94f97a9df10e6271319325ac4c56a86"
+
+[[package]]
+name = "handheld_halting"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "thiserror",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "991431c3519a3f36861882da93630ce66b52918dcf1b8e2fd66b397fc96f28df"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.57"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4211ce9909eb971f111059df92c45640aad50a619cf55cd76476be803c4c68e6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76cc616c6abf8c8928e2fdcc0dbfab37175edd8fb49a4641066ad1364fdab146"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9be73a2caec27583d0046ef3796c3794f868a5bc813db689eed00c7631275cd1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
diff --git a/8-handheld_halting/Cargo.toml b/8-handheld_halting/Cargo.toml
new file mode 100644
index 0000000..4a1d48c
--- /dev/null
+++ b/8-handheld_halting/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "handheld_halting"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.37"
+thiserror = "1.0.23"
diff --git a/8-handheld_halting/data/input b/8-handheld_halting/data/input
new file mode 100644
index 0000000..952208c
--- /dev/null
+++ b/8-handheld_halting/data/input
@@ -0,0 +1,623 @@
+acc -17
+nop +318
+jmp +1
+acc -10
+jmp +394
+acc +43
+acc +47
+nop +570
+jmp +176
+acc -9
+jmp +322
+jmp +73
+acc +4
+acc -4
+jmp +460
+jmp +228
+acc +25
+acc +39
+jmp +50
+acc -12
+acc -14
+nop +275
+jmp +489
+acc -11
+jmp +338
+acc +21
+acc +10
+jmp +1
+acc +20
+jmp +445
+acc +7
+jmp +419
+acc -8
+acc +32
+jmp +181
+acc +19
+acc +5
+acc +46
+jmp +417
+acc +28
+acc +23
+acc +16
+jmp +225
+jmp +317
+jmp +309
+jmp +69
+acc -6
+acc -6
+jmp +127
+acc +49
+nop -38
+jmp +467
+acc +0
+acc -12
+acc -14
+jmp -46
+acc +14
+acc +2
+acc +2
+jmp +311
+acc +33
+jmp +364
+nop +234
+acc +24
+acc +37
+acc +18
+jmp +22
+jmp +303
+jmp +414
+jmp +318
+acc +22
+acc +27
+jmp +1
+jmp +150
+acc +34
+acc +15
+nop +200
+acc +6
+jmp +320
+nop +534
+acc +29
+jmp +147
+nop -20
+jmp +255
+jmp +10
+acc -15
+acc +3
+jmp +338
+nop +362
+acc -4
+jmp +1
+jmp +286
+acc -1
+jmp +497
+acc -4
+acc +23
+acc +4
+jmp +400
+acc +35
+acc +50
+jmp +133
+acc -17
+jmp -90
+jmp +7
+acc -17
+jmp +472
+acc +20
+jmp +280
+jmp +133
+jmp -15
+jmp +16
+acc -19
+acc -2
+jmp -64
+acc -17
+jmp +1
+jmp +385
+acc -5
+acc +34
+jmp +382
+acc +24
+acc -17
+acc +0
+acc +15
+jmp +466
+jmp +300
+acc +16
+jmp +302
+nop +479
+acc +16
+jmp +71
+acc +23
+jmp +1
+acc +8
+jmp +154
+jmp +410
+acc -8
+jmp +402
+acc +48
+acc +42
+acc +22
+acc +35
+jmp +50
+jmp -7
+acc -13
+acc +37
+acc +24
+jmp +243
+jmp +410
+acc -3
+acc +45
+jmp +416
+acc +2
+acc +25
+jmp -109
+jmp -41
+jmp +318
+acc -8
+acc -12
+jmp +169
+nop +393
+acc +7
+acc -12
+acc +35
+jmp +381
+acc +41
+nop -98
+acc +15
+acc -19
+jmp +218
+acc +24
+acc +47
+jmp +65
+acc +29
+jmp -129
+acc +23
+acc -13
+nop +60
+jmp -26
+nop -4
+acc -5
+acc +13
+nop -12
+jmp -13
+jmp -53
+acc +21
+jmp +276
+nop -27
+jmp +165
+acc +42
+nop +43
+jmp +1
+acc +26
+acc +22
+acc -3
+jmp +405
+acc +29
+nop -118
+acc +21
+nop -190
+jmp +217
+acc -1
+nop +223
+acc -8
+acc +45
+jmp +49
+acc +8
+acc +22
+jmp +209
+acc +44
+jmp +66
+acc +7
+acc -7
+acc +48
+jmp +318
+nop +398
+acc +2
+jmp +16
+nop +207
+nop +358
+acc +45
+acc +48
+jmp +267
+nop +248
+acc +26
+jmp +307
+acc +27
+jmp -197
+jmp -68
+acc +34
+acc +25
+acc -13
+jmp +133
+jmp -77
+acc -13
+acc +10
+jmp -193
+jmp -62
+acc +4
+acc -14
+jmp +261
+jmp +151
+jmp +208
+acc -10
+jmp +40
+acc +31
+jmp -216
+acc +23
+acc +34
+jmp +364
+nop +205
+acc -3
+acc +14
+jmp +59
+nop +359
+acc -4
+jmp +1
+jmp -248
+acc +47
+acc +35
+jmp +184
+acc +16
+nop -92
+acc -12
+jmp +354
+acc +27
+jmp -152
+acc -14
+acc -16
+acc +43
+jmp +147
+acc +45
+acc +24
+acc +6
+nop -46
+jmp +21
+acc +26
+jmp +1
+jmp +293
+acc -8
+acc +12
+acc -19
+acc -9
+jmp +94
+jmp +299
+acc +10
+acc -2
+jmp +75
+acc -7
+acc +3
+acc +47
+jmp +171
+acc +16
+acc +44
+acc -3
+jmp +14
+acc +30
+acc +34
+jmp -178
+acc +35
+nop -238
+acc +39
+jmp +1
+jmp -133
+acc +34
+acc -6
+jmp -276
+acc +1
+jmp -207
+acc +10
+jmp -43
+jmp -302
+acc -1
+nop -29
+jmp +1
+acc +17
+jmp -281
+acc +17
+jmp -109
+jmp +1
+acc +13
+nop -9
+jmp +245
+acc +5
+nop -15
+acc +3
+acc +7
+jmp +65
+acc -11
+jmp -313
+acc +47
+jmp +29
+jmp -289
+acc +18
+acc -17
+nop +73
+acc -12
+jmp +80
+acc +32
+acc -4
+acc +3
+jmp -126
+acc +16
+jmp -275
+nop -188
+acc -3
+acc +14
+jmp -155
+acc +33
+acc -19
+nop -166
+acc +20
+jmp +30
+nop -169
+acc +49
+nop +168
+jmp -24
+nop -345
+acc +34
+jmp -40
+jmp -56
+jmp +29
+jmp +191
+acc +24
+jmp +219
+acc +34
+acc +27
+acc +11
+jmp -260
+jmp -339
+acc +15
+nop +16
+jmp +1
+jmp +138
+jmp +1
+jmp +1
+jmp +14
+acc -11
+acc +45
+jmp -19
+acc +0
+jmp +27
+acc +0
+nop +128
+jmp -65
+nop -23
+jmp -318
+jmp -325
+jmp +1
+jmp -229
+jmp -270
+jmp -137
+acc +34
+acc +7
+jmp +1
+jmp -346
+acc +18
+jmp +37
+acc +40
+acc -16
+nop -146
+acc +35
+jmp -12
+acc +1
+acc +27
+acc +44
+acc +8
+jmp -276
+acc +16
+acc +42
+nop -342
+acc +13
+jmp -165
+acc -11
+acc -17
+acc -10
+jmp -26
+acc +10
+acc +43
+jmp -276
+acc +5
+acc +34
+acc +17
+acc -9
+jmp +99
+acc +29
+jmp -370
+acc -11
+jmp -412
+acc +47
+acc +21
+acc -12
+jmp -136
+jmp -124
+acc +12
+acc +0
+acc +25
+acc +27
+jmp -290
+acc +5
+acc +49
+acc +32
+nop +29
+jmp -202
+nop -296
+acc -12
+acc +9
+acc +21
+jmp +23
+jmp -345
+acc +26
+nop -123
+jmp -373
+nop +118
+jmp +43
+acc -15
+jmp -386
+jmp +1
+nop -370
+acc +47
+nop -141
+jmp -426
+acc +42
+acc +12
+acc +4
+nop -103
+jmp -122
+acc +23
+acc -4
+acc +11
+jmp -314
+jmp -73
+nop -1
+jmp -411
+acc +13
+acc +9
+nop -372
+jmp -293
+acc +46
+acc +3
+acc -1
+jmp +86
+acc +36
+jmp +100
+acc +27
+acc +49
+nop -4
+acc +47
+jmp -445
+acc +31
+acc +47
+acc -11
+acc +14
+jmp -181
+nop -438
+acc +31
+jmp -428
+nop -115
+nop -244
+jmp -464
+jmp -29
+nop -240
+jmp -241
+acc -12
+jmp -329
+nop +78
+acc +6
+jmp +1
+acc +49
+jmp -322
+jmp -133
+acc +20
+nop -83
+acc +35
+acc +29
+jmp -41
+acc +15
+jmp -46
+jmp -29
+acc +45
+acc -14
+acc +21
+jmp -366
+nop +84
+acc -6
+acc +25
+acc -17
+jmp -326
+acc -5
+nop -159
+acc +5
+jmp -171
+acc +42
+jmp -28
+acc +42
+acc -11
+acc +45
+acc +19
+jmp -305
+acc +38
+acc -13
+acc -16
+jmp -134
+acc +45
+jmp -256
+acc -15
+acc -18
+acc +28
+jmp -114
+acc -11
+acc +47
+nop -420
+jmp -90
+nop -330
+jmp +13
+acc -15
+acc +9
+jmp -159
+acc -12
+acc +0
+acc +0
+jmp -538
+acc +31
+acc +24
+acc +32
+acc -16
+jmp -95
+jmp -466
+acc +19
+acc +2
+jmp -172
+acc -12
+jmp -207
+acc +39
+acc +18
+acc +5
+jmp -211
+nop -507
+jmp +1
+jmp -197
+nop -227
+acc +28
+jmp -494
+acc +22
+acc +2
+acc -14
+jmp -377
+acc +8
+acc +29
+jmp -573
+acc -17
+acc +14
+acc +29
+acc +11
+jmp -351
+acc +9
+nop -540
+acc +30
+nop -344
+jmp -564
+acc -4
+nop -465
+jmp -293
+acc -18
+acc +5
+acc +29
+jmp -302
+acc -17
+acc +14
+acc +2
+acc -11
+jmp -527
+jmp -563
+acc +14
+acc +10
+jmp -505
+acc +43
+jmp -188
+nop -448
+acc +44
+acc +3
+acc +16
+jmp +1
diff --git a/8-handheld_halting/src/main.rs b/8-handheld_halting/src/main.rs
new file mode 100644
index 0000000..a27d082
--- /dev/null
+++ b/8-handheld_halting/src/main.rs
@@ -0,0 +1,246 @@
+use std::str::FromStr;
+use anyhow::Result;
+
+#[derive(Debug, Clone, PartialEq)]
+enum ISet {
+    Acc,
+    Jmp,
+    Nop,
+}
+
+#[derive(Debug, Clone)]
+struct Instruction {
+    execd: bool,
+    instr: ISet,
+    arg: i64
+}
+
+#[derive(Debug, thiserror::Error)]
+enum ParseError {
+    #[error("Expected {0}")]
+    Expected(&'static str)
+}
+
+
+impl FromStr for Instruction {
+    type Err = ParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let mut tokens = s.lines()
+            .next()
+            .ok_or(ParseError::Expected("one line"))?
+            .split_whitespace();
+        match tokens.next().ok_or(ParseError::Expected("instruction"))? {
+            "acc" => {
+                let arg = tokens
+                    .next()
+                    .ok_or(ParseError::Expected("acc argument"))?
+                    .parse()
+                    .unwrap();
+                Ok(Instruction {
+                    execd: false,
+                    instr: ISet::Acc,
+                    arg,
+                    
+                })
+            },
+            "nop" => {
+                let arg = tokens
+                    .next()
+                    .ok_or(ParseError::Expected("acc argument"))?
+                    .parse()
+                    .unwrap();
+                Ok(Instruction {
+                    execd: false,
+                    instr: ISet::Nop,
+                    arg, // For part 1 at least NOP args are useless
+                })
+            },
+            "jmp" => {
+                let arg = tokens
+                    .next()
+                    .ok_or(ParseError::Expected("acc argument"))?
+                    .parse()
+                    .unwrap();
+                Ok(Instruction {
+                    execd: false,
+                    instr: ISet::Jmp,
+                    arg,
+                })
+            },
+            _ => Err(ParseError::Expected("acc, nop or jmp instruction"))
+        }
+    }
+}
+
+impl Instruction {
+    fn exec(&mut self, pc: &mut usize, acc: &mut i64) {
+        self.execd = true;
+        match self.instr {
+            ISet::Acc => {
+                *acc += self.arg;
+                *pc += 1;
+            }
+            ISet::Jmp => {
+                // Expect this to panic hard if you underflow :3
+                *pc = ((*pc as i64) + self.arg) as usize;
+            }
+            ISet::Nop => {
+                *pc += 1;
+            }
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+struct Program {
+    prog: Vec<Instruction>,
+    pc: usize,
+    acc: i64,
+}
+
+impl Program {
+    fn load(s: &str) -> Result<Program, ParseError> {
+        let loaded_program: Vec<Instruction> = s
+            .lines()
+            .map(|l| Instruction::from_str(l))
+            .collect::<Result<Vec<Instruction>, ParseError>>()?;
+        Ok(
+            Self {
+                prog: loaded_program,
+                pc: 0,
+                acc: 0,
+            }
+        )
+    }
+
+    fn reset(&mut self) {
+        self.pc = 0;
+        self.acc = 0;
+        for mut i in self.prog.iter_mut() {
+            i.execd = false;
+        }
+    }
+
+    /// Returns whether execution finished :
+    /// Normally (true) - executing one instruction after the last one
+    /// Or abnormalaly (false) - looping forever or executing random 
+    /// instructions
+    fn exec_until_loop(&mut self) -> bool {
+        let pc_stop = self.prog.len();
+        loop {
+            // Terminate on infinite loop
+            if self.prog[self.pc].execd {
+                println!("Infinite loop !");
+                return false;
+            }
+            
+            self.prog[self.pc].exec(&mut self.pc, &mut self.acc);
+
+            // Terminate on success
+            if self.pc == pc_stop {
+                println!("Good pc !");
+                return true;
+            }
+            // Terminate on corrupted pc
+            else if !(0..=pc_stop).contains(&(self.pc)) {
+                println!("Corrupted pc !");
+                return false;
+            }
+        }
+    }
+
+    fn find_corrupted_instruction(&mut self) -> Option<i64> {
+        // Test jmps -> nops
+        self.reset();
+        for j in (0..self.prog.len())
+            .filter(|&i| self.prog[i].instr == ISet::Jmp)
+        {
+            println!("Switch jmp-nop at pos {}", j);
+            let mut pclone = self.clone();
+            pclone.prog[j].instr = ISet::Nop;
+            if pclone.exec_until_loop() {
+                return Some(pclone.acc);
+            }
+        }
+        // Test nops -> jmps
+        for n in (0..self.prog.len())
+            .filter(|&i| self.prog[i].instr == ISet::Nop)
+        {
+            println!("Switch nop-jmp at pos {}", n);
+            let mut pclone = self.clone();
+            pclone.prog[n].instr = ISet::Jmp;
+            if pclone.exec_until_loop() {
+                return Some(pclone.acc);
+            }
+        }
+        None
+    }
+}
+
+fn main() {
+    let input = include_str!("../data/input");
+    let mut prog = Program::load(input).unwrap();
+    prog.exec_until_loop();
+    println!("Acc before program gets into second loop : {}", prog.acc);
+    println!("Acc after the program is set to terminate : {}", prog.find_corrupted_instruction().unwrap());
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_nop() {
+        let input = r"nop +0";
+        let mut prog = Program::load(input).unwrap();
+        prog.exec_until_loop();
+        assert_eq!(prog.acc, 0)
+    }
+
+    #[test]
+    fn test_acc() {
+        let input = r"acc +5";
+        let mut prog = Program::load(input).unwrap();
+        prog.exec_until_loop();
+        assert_eq!(prog.acc, 5)
+    }
+
+    #[test]
+    fn test_jmp() {
+        let input = r"jmp +2
+acc +1
+acc +1";
+        let mut prog = Program::load(input).unwrap();
+        prog.exec_until_loop();
+        assert_eq!(prog.acc, 1)
+    }
+
+    #[test]
+    fn test_short_loop() {
+        let input = r"acc +1
+jmp +2
+acc +1
+acc +1
+jmp -4";
+        let mut prog = Program::load(input).unwrap();
+        prog.exec_until_loop();
+        assert_eq!(prog.acc, 2)
+    }
+
+    #[test]
+    fn test_exec() {
+        let input = r"nop +0
+acc +1
+jmp +4
+acc +3
+jmp -3
+acc -99
+acc +1
+jmp -4
+acc +6";
+        let mut prog = Program::load(input).unwrap();
+        prog.exec_until_loop();
+        assert_eq!(prog.acc, 5)
+    }
+}
\ No newline at end of file
diff --git a/9-encoding_error/.gitignore b/9-encoding_error/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/9-encoding_error/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/9-encoding_error/Cargo.toml b/9-encoding_error/Cargo.toml
new file mode 100644
index 0000000..2c72f9a
--- /dev/null
+++ b/9-encoding_error/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "encoding_error"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/9-encoding_error/data/input b/9-encoding_error/data/input
new file mode 100644
index 0000000..20f8901
--- /dev/null
+++ b/9-encoding_error/data/input
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diff --git a/9-encoding_error/src/main.rs b/9-encoding_error/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/9-encoding_error/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}