Path 1: 4 calls (1.0)

list (4) 

1def combine_mapreduce_data(self, linesets_collection: list[list[LineSet]]) -> None:
2        """Reduces and recombines data into a format that we can report on.
3
4        The partner function of get_map_data()
5        """
6        self.linesets = [line for lineset in linesets_collection for line in lineset]