def cut_ipv6(column: str, prefix_len_v4: int, prefix_len_v6: int) -> str:
    """
    >>> cut_ipv6("col", 24, 64)
    'toIPv6(cutIPv6(col, 8, 1))'
    """
    bytes_v4 = int(4 - (prefix_len_v4 / 8))
    bytes_v6 = int(16 - (prefix_len_v6 / 8))
    return f"toIPv6(cutIPv6({column}, {bytes_v6}, {bytes_v4}))"