37:14 0
students
37:14 
01:11:42 5
16:47
1
08:00 0
10:19 2
01:58:59 4
06:05
10
05:47
2
27:22 3
28:15 0
25:34 0
30:19 5
38:35 3
19:04 0
10:53 1
11:01 0
11:29 0
12:48 0
29:57
2
39:46 1
