22:00 0
teacher
22:00 
34:00 0
10:00 4
24:00 11
26:00 30
26:00 2
21:00 2
06:00 4
06:00 9
24:00 6
12:00 38
18:00 40
33:00 14
14:00 35
06:00 19
10:00 16
08:00 12
28:00 11
08:00 9
41:00 10