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

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

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

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

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