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

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

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

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

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