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

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

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

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

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