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

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

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

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

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