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

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

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

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

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