diff --git a/src/main.rs b/src/main.rs
index 61b2c22..88bfc5e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -28,4 +28,9 @@ fn main() {
         let max_part1 = prob4::solve(file_path, &prob4::mutual_inclusion);
         println!("Solution for problem 4 part 1: {max_part1}");
     }
+    {
+        let file_path = "prob4_part1.txt";
+        let max_part1 = prob4::solve(file_path, &prob4::complete_overlap);
+        println!("Solution for problem 4 part 2: {max_part1}");
+    }
 }
diff --git a/src/prob4/mod.rs b/src/prob4/mod.rs
index 6219ab8..491afa2 100644
--- a/src/prob4/mod.rs
+++ b/src/prob4/mod.rs
@@ -3,6 +3,10 @@ pub fn mutual_inclusion(first_pair: &[u32], second_pair: &[u32]) -> bool {
         || (second_pair[0] <= first_pair[0] && second_pair[1] >= first_pair[1])
 }
 
+pub fn complete_overlap(first_pair: &[u32], second_pair: &[u32]) -> bool {
+    (second_pair[0] <= first_pair[0] && first_pair[0] <= second_pair[1]) || (second_pair[0] <= first_pair[1] && first_pair[1] <= second_pair[1])
+}
+
 pub fn solve(file_path: &str, unary_operator: &dyn Fn(&[u32], &[u32]) -> bool) -> i32 {
     std::fs::read_to_string(file_path)
         .expect("Please provide a text file as an argument.")