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