diff --git a/README.md b/README.md
index 6f49387..914a301 100644
--- a/README.md
+++ b/README.md
@@ -678,9 +678,7 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
             - preorder (DFS: self, left, right)
 
 - ### Binary search trees: BSTs
-    - [ ] [Binary Search Tree Review (video)](https://www.youtube.com/watch?v=x6At0nzX92o&index=1&list=PLA5Lqm4uh9Bbq-E0ZnqTIa8LRaL77ica6)
-    - [ ] [Series (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/p82sw/core-introduction-to-binary-search-trees)
-        - starts with symbol table and goes through BST applications
+    - [ ] [Binary Search Tree Review (video)](https://www.youtube.com/watch?v=x6At0nzX92o&index=1&list=PLA5Lqm4uh9Bbq-E0ZnqTIa8LRaL77ica6)    
     - [ ] [Introduction (video)](https://www.coursera.org/learn/data-structures/lecture/E7cXP/introduction)
     - [ ] [MIT (video)](https://www.youtube.com/watch?v=9Jry5-82I68)
     - C/C++: