00:14
0
student
00:14 
08:41:40
6
00:05
1
02:58
0
22:40:39
0
13:48
0
00:11
0
15:04
3
01:41
0
00:21
2
02:10
5
01:21
1
00:05
0
04:09
1
00:01
1
00:11
0
00:01
2
00:04
0
06:59
2
09:41:40
0