def dfs_error(self, root, cur, result):
        if not root:
            return

        cur.append(root.val)

        if not root.left and not root.right:
            result.append(cur)
            return

        if root.left:
            self.dfs_error(root.left, cur, result)  # reference to the same list
        if root.right:
            self.dfs_error(root.right, cur, result)
Outputs 2d embeded plot based on `pos`
dataset/ETHPy150Open algorhythms/LeetCode/129 Sum Root to Leaf Numbers.py/Solution.dfs_error--crossover with--dataset/ETHPy150Open inpho/vsm/vsm/extensions/clustering/manifold.py/Manifold.plot