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![Def delNodes(self, root: Optional[TreeNode], to_delete: List[int]) -> List[TreeNode]:
What does optional mean in the above python function definition](https://static.ahvideoscdn.net/wp-content/uploads/kleveof342a/def-delnodesself-root-optionaltreenode-to_delete-listint-listtreenode-what-does-optional-mean-in-the-above-python-function-definition.jpg)
