Question: Please do not change the source code. Q8 (10pts): Given a binary search tree, write an instance method between(...) that takes a lower bound lower
Please do not change the source code.

Q8 (10pts): Given a binary search tree, write an instance method between(...) that takes a lower bound lower and an upper bound upper and returns a HashSet containing all of the data elements x in the tree between lower and upper, inclusive. To add an element x to the HashSet h, use h.add(x). import java.util. HashSet; class TreeNode
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