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