02:16
2
student
02:16 
02:43
0
02:15
0
02:56
1
41:08
2
07:52
0
43:52
1
54:52
9
33:53
0
31:21
0
18:56
0
09:09
4
00:58
1
01:28
1
04:34
1
03:03
3
01:57
0
01:06
2
03:13
4
01:14
1
01:06
0
01:05
0
03:58
0
04:46
2
01:05
2
01:24
0
01:07
0
02:23
10
00:58
1
00:38
1