docs: def __delete(self, multicolor):
          """ Reduces information :class:`Multicolor` attribute by iterating over supplied colors data.
  
          In case supplied argument is a :class:`Multicolor` instance, multi-color specific information to de deleted is set to its :attr:`Multicolor.multicolors`.
          In other cases multi-color specific information to de deleted is obtained from iterating over the argument.
  
          Colors and their multiplicity is reduces with a help of ``-`` method of python Counter object.
  
          :param multicolor: information about colors to be deleted from :class:`Multicolor` object
          :type multicolor: any iterable with colors object as entries or :class:`Multicolor`
          :return: ``None``, performs inplace changes
          """
          if isinstance(multicolor, Multicolor):
              to_delete = multicolor.multicolors
          else:
              to_delete = Counter(color for color in multicolor)
          self.multicolors = self.multicolors - to_delete