13
teacher
00:01
11
01:01
10
12:00
7
7
14:31
6
15:30
6
12:55
6
12:11
5
00:04
5
00:10
4
14:00
3
07:46
3
00:05
3
11:51
3
10:00
2
07:16
2
01:08
2
00:01
2
11:57
1
00:02
1
08:05
1