(0 20 18)(1 21 15 10 3)(2 16 4)(5 14 12 9 6)(7 11 8)(13 19 17)
ALLOWS (11/8)-SEQUENCE
1: (0 1 18)
(0)(1 20 18 21 15 10 3)(2 16 4)(5 14 12 9 6)(7 11 8)(13 19 17)
2: (15 18 21)
(0)(1 20 18 10 3)(2 16 4)(5 14 12 9 6)(7 11 8)(13 19 17)(15)(21)
3: (13 19 17)
(0)(1 20 18 10 3)(2 16 4)(5 14 12 9 6)(7 11 8)(13)(15)(17)(19)(21)
4: (10 20 18)
(0)(1 20 3)(2 16 4)(5 14 12 9 6)(7 11 8)(10)(13)(15)(17)(18)(19)(21)