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

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

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

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

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