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