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

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

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

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

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