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

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

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

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

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