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

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

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

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

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