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

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

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

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

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