1l1_4
2l1_5
3l1_6
4l1_7
5l1_8
6l1_9
7l1_10
8l1_14
9l2_1
10l2_2
11l2_3
12l2_4
13l2_5
14l2_6
15l2_7
16l2_8
17l2_9
18