def METHOD_NAME(self):
    """Boltzmann sampling - non redundant"""
    fc = prepare_fc()
    ss  = fc.pbacktrack(100, RNA.PBACKTRACK_NON_REDUNDANT)
    self.assertEqual(len(ss), 100)
    for s in ss:
        self.assertEqual(len(s), len(sequence))
    # check for uniqueness, i.e. no duplicates
    sss = list(set(ss))
    self.assertEqual(len(ss), len(sss))