diff --git a/2020/11/main.py b/2020/11/main.py
index 21d9380..b410cbb 100644
--- a/2020/11/main.py
+++ b/2020/11/main.py
@@ -12,11 +12,6 @@ class PuzzleSolver:
 		self.width = len(self.data[0])
 		self.height = len(self.data)
 
-	def is_adjacent(self, x1, y1, x2, y2):
-		dy = abs(y2 - y1)
-		dx = abs(x2 - x1)
-		return dy <= 1 and dx <= 1
-
 	def occupied_adjacent(self, x, y):
 		n = 0
 		for j in range(y-1, y+2):