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

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

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

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

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