def __init__(
        self,
        label: int | None = None,
        color: int = 0,
        parent: RedBlackTree | None = None,
        left: RedBlackTree | None = None,
        right: RedBlackTree | None = None,
    ) -> None:
        self.label = label
        self.parent = parent
        self.left = left
        self.right = right
        self.color = color