code: def not_right(self, num):
          
          if num == None:
              return FlatList([_get_list(self)[:-1:]])
          if num <= 0:
              return FlatList.EMPTY
  
          return FlatList(_get_list(self)[:-num:])
docs: WITH SLICES BEING FLAT, WE NEED A SIMPLE WAY TO SLICE FROM THE LEFT [:-num:]