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