18
12345
6
7
8
9 10 11
12-13
14-16
17
19-20, 15
22
18, 15-16
23 24
25
26
27
28
29,20
30
19-20
31
32
33
34
35
36
37
38
39
1
40
41
42
43
48
49
44-47
21