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

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

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

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

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