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