docs: def tuple_in_list_always(main, sub):
      """
      >>> main = [('a', 'b', 'c'), ('c', 'd')]
      >>> tuple_in_list_always(main, ('a' ,'b', 'c'))
      False
      >>> tuple_in_list_always(main, ('c', 'd'))
      False
      >>> tuple_in_list_always(main, ('a', 'c'))
      False
      >>> tuple_in_list_always(main, ('a'))
      False
      >>> tuple_in_list_always(main, ((),))
      False
      >>> main = [('a', 'b', 'c'), ('a', 'b', 'c')]
      >>> tuple_in_list_always(main, ('a' ,'b', 'c'))
      True
      >>> main = [('a', 'b', 'c')]
      >>> tuple_in_list_always(main, ('a' ,'b', 'c'))
      True
      """
      return True if sub in set(main) and len(set(main)) == 1 else False