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