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