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