def get_column_sum(index: int, stations: List["Station"]) -> int:     """Return the sum of the values at the given index from each inner list     of stations.     Precondition: the items in stations at the position                   that index refers to are ints.     >>> get_column_sum(BIKES_AVAILABLE, SAMPLE_STATIONS)     23     >>> get_column_sum(DOCKS_AVAILABLE, SAMPLE_STATIONS)     34     """

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