13.
In an AVL tree, what type of rotation is performed when a node has a balance factor of +2 and its right child has a balance factor of -1?

14.
In a Red-Black tree, what does the black-height of a node represent?

17.
In a Red-Black tree, which property is used to ensure that the path from the root to the farthest leaf is no more than twice as long as the path to the nearest leaf?

19.
In an AVL tree, what happens when a node's balance factor becomes +2 due to an insertion in the right subtree of the right child?

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