@classmethod
def iter_pegasus_to_nice_pairs(cls, plist):
    """Return an iterator converting a sequence of pairs of 4-term Pegasus
        coordinates to pairs of 5-term nice coordinates.

        Note that this method does not depend on the size of the Pegasus
        lattice.
        """
    return cls._pair_repack(cls.iter_pegasus_to_nice, plist)
