0 9 7 1 5 10 11->b(6,8,7,1,5,10,11)1->a(2,3,12,21,19,13,15,22)2->NULL
1 6 8 7 1 5 10 11->b(6,8,7,1,5,10,11)1->a(2,3,12,21,19,13,15,22)2->NULL
2 [2 3 12 21 19 13 15 22]->b(16,17)3->a(4,8,7,1,5,10,11,14,20,19,13,15,22)4->NULL
3 16 17->b(18,20,19,13,15,22)5->NULL
4 [4 8 7 1 5 10 11 14 20 19 13 15 22]->b(6,8,7,1,5,10,11,16,17)6->a(2,3,12,21,19,13,15,22,14,20)7->NULL
5 [18 20 19 13 15 22]->b(16,17)3->a(14,20,19,13,15,22)4->NULL
6 6 8 7 1 5 10 11 16 17->b(6,8,7,1,5,10,11,18,20,19,13,15,22)8->a(2,3,12,21,19,13,15,22)2->NULL
7 [2 3 12 21 19 13 15 22 14 20]->b(16,17)3->a(4,8,7,1,5,10,11,14,20,19,13,15,22)4->NULL
8 [6 8 7 1 5 10 11 18 20 19 13 15 22]->b(6,8,7,1,5,10,11,16,17)6->a(2,3,12,21,19,13,15,22,14,20)7->NULL