def Channels(module):
    """
    Returns the channels contained in the given K2 module.

    """
    nums = {(2): 1, (3): 5, (4): 9, (6): 13, (7): 17, (8): 21, (9): 25, (10
        ): 29, (11): 33, (12): 37, (13): 41, (14): 45, (15): 49, (16): 53,
        (17): 57, (18): 61, (19): 65, (20): 69, (22): 73, (23): 77, (24): 81}
    if module in nums:
        return [nums[module], nums[module] + 1, nums[module] + 2, nums[
            module] + 3]
    else:
        return None
