docs: def duplicates(base, items):
      """Get an iterator of items similar but not equal to the base.
  
      @param base: base item to perform comparison against
      @param items: list of items to compare to the base
      @return: generator of items sorted by similarity to the base
  
      """
      for item in items:
          if item.similarity(base) and not item.equality(base):
              yield item