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

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

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

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

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