(0 20 17)(1 13 12)(2 21 4)(3 14 10 8 5)(6 9 7)(11 18 15 19 16)
ALLOWS (11/8)-SEQUENCE
1: (0 12 17)
(0)(1 13 12 20 17)(2 21 4)(3 14 10 8 5)(6 9 7)(11 18 15 19 16)
2: (11 18 15)
(0)(1 13 12 20 17)(2 21 4)(3 14 10 8 5)(6 9 7)(11 19 16)(15)(18)
3: (1 13 17)
(0)(1)(2 21 4)(3 14 10 8 5)(6 9 7)(11 19 16)(12 20 17)(13)(15)(18)
4: (11 19 16)
(0)(1)(2 21 4)(3 14 10 8 5)(6 9 7)(11)(12 20 17)(13)(15)(16)(18)(19)