00:59
5
student
00:59 
00:56
0
00:49
0
01:07
0
00:30
0
01:21
3
01:14
0
02:25
0
02:29
0
02:00
0
04:15
0
01:08
0
01:45
0
01:30
0
01:19
0
01:07
0
00:52
2
00:26
1
01:12
1
01:23
0
03:15
0
00:25
0
03:48
0
01:15
0
02:50
0
00:38
0
01:06
0
03:40
0
02:25
0
05:22
0