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

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

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

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

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