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

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

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

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

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