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

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

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

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

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