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

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

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

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

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