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