class Node:

    def insert_after(self, value):
        pass

    def insert_before(self, value):
        pass

    def remove(self):
        pass


class DLL:

    def add_to_head(self):
        pass

    def remove_from_head(self):
        pass

    def add_to_tail(self):
        pass

    def remove_from_tail(self):
        pass

    def move_to_front(self):
        pass

    def move_to_end(self):
        pass

    def delete(self):
        pass

    def get_max(self):
        pass
