code: 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 Nonf 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
docs: Returns the channels contained in the given K2 module.