Level order traversal in spiral form

Level order traversal is a technique used in tree traversal algorithms to visit all nodes of a binary tree in a level-by-level order. In this traversal, all nodes at the same depth (or level) in the tree are visited before moving to the next level.

Spiral form, also known as zigzag order, is a variant of the level order traversal algorithm. In this traversal, nodes are visited in a zigzag pattern across the levels of the tree. Starting at the root node, nodes at even levels are visited from left to right, and nodes at odd levels are visited from right to left.

For example, consider the following binary tree:

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