Level-order Traversal

In level-order traversal, nodes are visited level by level from left to right, starting from the root.

Following the level-order traversal will generate this sequence:

$$ 9, 5, 17, 2, 7, 12, 21, 4, 8, 14, 20, 25 $$

Exercise Carry out the level-order traversal for the following BST.