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Did you finish Parts I, II, and III of our binary search tree implementation exercises? If you're looking for more practice, complete the following CodeWars problems:
https://www.codewars.com/kata/sum-the-tree/train/javascript
https://www.codewars.com/kata/fun-with-trees-array-to-tree
https://www.codewars.com/kata/fun-with-trees-is-perfect
https://leetcode.com/problems/unique-binary-search-trees/
When you're ready, move on to Binary Heaps