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

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

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

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

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