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