LOOP t,t_prime: 4 5
N_prime {'a': ['b'], 'c': ['b'], 'b': ['a', 'c']}
N_plus {'a': ['b'], 'c': ['b'], 'b': ['a', 'c']}
w,d_wplus a {'a': 0, 'c': 2, 'b': 1}
w,sigma_wplus a {'a': 1, 'c': 1, 'b': 1}
vol {(4, 'c'): (1, 0), (5, 'a'): (1.0, 0), (4, 'b'): (1, 0), (4, 'a'): (1, 0)}
w,d_wplus b {'a': 1, 'c': 1, 'b': 0}
w,sigma_wplus b {'a': 1, 'c': 1, 'b': 1}
vol {(4, 'c'): (1, 0), (5, 'b'): (1.0, 1), (5, 'a'): (1.0, 0), (4, 'b'): (1, 0), (4, 'a'): (1, 0)}
w,d_wplus c {'a': 2, 'c': 0, 'b': 1}
w,sigma_wplus c {'a': 1, 'c': 1, 'b': 1}
vol {(4, 'b'): (1, 0), (5, 'a'): (1.0, 0), (4, 'c'): (1, 0), (4, 'a'): (1, 0), (5, 'c'): (0.0, 2), (5, 'b'): (1.0, 1)}
set(['a', 'c', 'b'])
set([(4.0, 5.0, 'b', 'a'), (4.0, 5.0, 'b', 'c'), (4.0, 5.0, 'a', 'b'), (4.0, 5.0, 'c', 'b')])