(self)
return self.iterate_binary(-1)
Generates the previous binary ordered subset.

        Examples
        ========

        >>> from sympy.combinatorics.subsets import Subset
        >>> a = Subset([], ['a','b','c','d'])
        >>> a.prev_binary().subset
        ['a', 'b', 'c', 'd']
        >>> a = Subset(['c','d'], ['a','b','c','d'])
        >>> a.prev_binary().subset
        ['c']

        See Also
        ========
        next_binary, iterate_binary
Generates the previous binary ordered subset.
Generates the previous binary ordered subset .
def prev_binary(self):
        """
        Generates the previous binary ordered subset.

        Examples
        ========

        >>> from sympy.combinatorics.subsets import Subset
        >>> a = Subset([], ['a','b','c','d'])
        >>> a.prev_binary().subset
        ['a', 'b', 'c', 'd']
        >>> a = Subset(['c','d'], ['a','b','c','d'])
        >>> a.prev_binary().subset
        ['c']

        See Also
        ========
        next_binary, iterate_binary
        """
        return self.iterate_binary(-1)
def prev_binary ( self ) : return self . iterate_binary ( - 1 )