Judges' note for Leaves
The last input set is for the following tree.  
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              Y
            /   \
          R      Z
        /    \     
      L        T
    /    \   /   \
  D       P S     W
 / \     / \     / \
B  H    N   Q   U   X
  / \  / \       \
 F  J M   O       V