diff --git a/Cargo.lock b/Cargo.lock
index b2daae0..021e978 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -9,6 +9,7 @@ dependencies = [
  "dotenv",
  "hex-literal",
  "itertools",
+ "lazy_static",
  "pico-args",
  "reqwest",
  "rust-crypto",
diff --git a/Cargo.toml b/Cargo.toml
index 84a005b..b5a7d7b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,7 @@ default-run = "aoc"
 dotenv = "0.15.0"
 hex-literal = "0.3.4"
 itertools = "0.10.5"
+lazy_static = "1.4.0"
 pico-args = "0.5.0"
 reqwest = { version = "0.11.13", features = ["blocking"] }
 rust-crypto = "0.2.36"
diff --git a/src/bin/05.rs b/src/bin/05.rs
new file mode 100644
index 000000000..58092bd
--- /dev/null
+++ b/src/bin/05.rs
@@ -0,0 +1,78 @@
+use itertools::Itertools;
+use lazy_static::lazy_static;
+pub fn part_one(input: &str) -> Option<u32> {
+    let mut count = 0;
+
+    lazy_static! {
+        static ref VOWELS: Vec<char> = vec!['a', 'e', 'i', 'o', 'u'];
+    };
+
+    lazy_static! {
+        static ref PAIRS: Vec<(char, char)> = vec![('a', 'b'), ('c', 'd'), ('p', 'q'), ('x', 'y')];
+    };
+
+    for keyword in input.to_ascii_lowercase().split('\n') {
+        let vowels = keyword.chars().filter(|c| VOWELS.contains(c)).count();
+        if vowels < 3 {
+            continue;
+        };
+        let mut double = false;
+        let mut contains_forbidden = false;
+        for (letter, next) in keyword.chars().tuple_windows() {
+            contains_forbidden |= PAIRS.contains(&(letter, next));
+            if letter == next {
+                double = true;
+            }
+        }
+        if double && !contains_forbidden {
+            count += 1;
+        };
+    }
+    Some(count)
+}
+
+pub fn part_two(input: &str) -> Option<u32> {
+    let mut count = 0;
+
+    for keyword in input.to_ascii_lowercase().split('\n') {
+        let mut split_repeat = false;
+        for (a, _, c) in keyword.chars().tuple_windows() {
+            split_repeat |= a == c;
+        }
+
+        if !split_repeat {
+            continue;
+        };
+
+        for i in 2..keyword.len() {
+            if keyword[i..].contains(&keyword[i - 2..i]) {
+                count += 1;
+                break;
+            }
+        }
+    }
+
+    Some(count)
+}
+fn main() {
+    let input = &aoc::read_file("inputs", 5);
+    aoc::solve!(1, part_one, input);
+    aoc::solve!(2, part_two, input);
+}
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_part_one() {
+        // let input = aoc::read_file("test_inputs", 5);
+        let input = "aaa";
+        assert_eq!(part_one(&input), Some(1));
+    }
+    #[test]
+    fn test_part_two() {
+        // let input = aoc::read_file("test_inputs", 5);
+        let input =
+            "qjhvhtzxzqqjkmpb\nxxyxx\nuurcxstgmygtbstg\nieodomkazucvgmuy\naaa";
+        assert_eq!(part_two(&input), Some(2));
+    }
+}