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

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

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

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

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