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