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

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

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

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

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