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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def insert_node(self, node):
 """ Adds node if name is available or pre-existing node returns True if added returns False if not added """

        if self._is_node_reserved(node):
            return False

        # Put node in map
        self._node_map[node.get_id()] = node
        return True