diff --git a/2-Data Structures/Week6-Binary Search Trees/4-splay tree.py b/2-Data Structures/Week6-Binary Search Trees/4-splay tree.py
index 81a83e4..d1ef9fd 100644
--- a/2-Data Structures/Week6-Binary Search Trees/4-splay tree.py	
+++ b/2-Data Structures/Week6-Binary Search Trees/4-splay tree.py	
@@ -124,7 +124,6 @@ def merge(left, right):
         right = right.left
     right = splay(right)
     right.left = left
-    left.parent = right # starter file里忘掉了
     update(right)  # important!!
     return right