HW 1 
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10 xxxx
11
12
13 x
14
15 xxxx
16 
17 xxxx
18 x
19
20 xxxxxxxxx
21 
22 xxx
23 xxxxx
24 
25 xxxxxxxxxxxxxxx
26 
27 xxxxxxxx
28 x
29 
30 xxxxxxxxxxxxxxx
31 
32 xxxxxx
33 xx
34
35 xxxxxxxxxxxx
36
37
38 x
39
40 x