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

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

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

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

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