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Whether you're working with a road map or just some numerical data, organizing data in trees allows for an efficient representation of connections and hierarchies.

Suppose the keys 55,63,31,17,22,40 are inserted into a binary tree in that order. Which of the following is the BST that is formed?

**A:**

**B:**

**C:**

**D:**

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Given a binary search tree, we want to write a `search`

method. This method will look for a node with a specific `key`

and return that node. Below is an incomplete implementation

The two redboxes indicate missing code. What lines should replace box 1 and box 2 respectively?

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Which of the insertion sequences cannot produce the binary search tree below?

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