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