19:01 4
teacher
19:01 
05:09 0
01:57 0
02:55 0
06:47 0
18:37 2
06:19
1
18:52 0
05:23 1
06:40 0
49:54 4
12:52 0
14:54 3
06:59 3
47:20 6
06:20 0
38:44 3
42:24 2
16:34 2
42:19 0
