diff --git a/interactions.py b/interactions.py
index f9cab9c..c13478e 100644
--- a/interactions.py
+++ b/interactions.py
@@ -18,7 +18,7 @@ vertex_adj = [
   (0, 1), (0, 3), (0, 5), (0, 7), (0, 9),
   (2, 8), (2, 6), (6, 10), (10, 4), (4, 8),
   (2, 9), (2, 11), (2, 5),
-  (4, 1), (4, 9), (4, 7),
+  (4, 1), (4, 11), (4, 7),
   (6, 3), (6, 11), (6, 9),
   (8, 5), (8, 11), (8, 1),
   (10, 7), (10, 11), (10, 3),