from typing import Any, Union


class BinaryTreeNode:
    data: Any
    left: Union['BinaryTreeNode', None]
    right: Union['BinaryTreeNode', None]

    def __init__(self, data: Any):
        self.data = data
        self.left = None
        self.right = None

    def traverse_inorder(self):
        if self.left:
            self.left.traverse_inorder()

        yield self.data

        if self.right:
            self.right.traverse_inorder()

    def traverse_preorder(self):
        yield self.data

        if self.left:
            self.left.traverse_preorder()

        if self.right:
            self.right.traverse_preorder()

    def traverse_postorder(self):
        if self.left:
            self.left.traverse_preorder()

        if self.right:
            self.right.traverse_postorder()

        yield self.data