0 1->a(2,9,7,3,5,10)1->NULL
1 [2 9 7 3 5 10]->1(6,8,7,3,5,10)2->a(4,8,7,3,5,10)3->NULL
2 [6 8 7 3 5 10]->1(6,8,7,3,5,10)2->a(4,8,7,3,5,10)3->NULL
3 [4 8 7 3 5 10]->1(6,8,7,3,5,10)2->a(4,8,7,3,5,10)3->NULL