(self, rank, superset)
return Subset.subset_from_bitlist(superset, bits)
Gets the binary ordered subset of the specified rank.

        Examples
        ========

        >>> from sympy.combinatorics.subsets import Subset
        >>> Subset.unrank_binary(4, ['a','b','c','d']).subset
        ['b']

        See Also
        ========
        iterate_binary, rank_binary
Gets the binary ordered subset of the specified rank.
Gets the binary ordered subset of the specified rank .
def unrank_binary(self, rank, superset):
        """
        Gets the binary ordered subset of the specified rank.

        Examples
        ========

        >>> from sympy.combinatorics.subsets import Subset
        >>> Subset.unrank_binary(4, ['a','b','c','d']).subset
        ['b']

        See Also
        ========
        iterate_binary, rank_binary
        """
        bits = bin(rank)[2:].rjust(len(superset), '0')
        return Subset.subset_from_bitlist(superset, bits)
def unrank_binary ( self , rank , superset ) : bits = bin ( rank ) [ 2 : ] . rjust ( len ( superset ) , '0' ) return Subset . subset_from_bitlist ( superset , bits )