From 22413c844b73b8a34373352ce6c7751678a3ff21 Mon Sep 17 00:00:00 2001
From: aaron <aaron@duckpond.ch>
Date: Sun, 4 Dec 2022 14:34:47 +0100
Subject: [PATCH] add function comment

---
 4/cleanup.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/4/cleanup.py b/4/cleanup.py
index d091b9e..acb0b64 100644
--- a/4/cleanup.py
+++ b/4/cleanup.py
@@ -3,6 +3,9 @@ from aocd import submit
 
 
 def find_overlaps(sets: list) -> int:
+    """
+    count the number of sets that overlap
+    """
     overlaps = [1 if set.intersection(*pair) else 0 for pair in sets]
     return sum(overlaps)