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

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

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

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

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