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

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

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

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

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