chem form 1

51:23

11:57

13:00

5:59

36:40

30:49

45:23

19:55

10:42

14:42

3:37

36:15

16:31

16:45

15:26

14:43

12:35

15:05

15:45

16:02

14:49

11:40

16:28

15:43

14:20

17:59

11:50

10:54

10:53

11:09

17:05

7:41

14:05

9:51

8:18

6:08

8:29

4:38

8:18

8:30