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

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

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

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

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