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