1(0)->a->2
2(0)->$->9
9(0)->$->7
9(0)->$->10
7(0)->$->3
7(0)->$->5
3(0)->a->4
4(0)->$->8
8(0)->$->7
8(0)->$->10
10(1)
5(0)->1->6
6(0)->$->8