presentation in ppt

20:44

27:10

00:59

8:33

13:05

5:36

6:08

6:12

8:02

12:23

3:48

20:17

5:08

5:47

11:28

10:34

9:51

14:08

1:47

8:22

19:17

12:40

5:31

6:44

6:21

1:25

15:49

5:19

15:31

4:02

32:00

7:06

16:45

7:38

8:08

12:13

11:18

21:41

4:11:34

5:07

8:14

5:51

10:34

18:19

00:52

2:07

3:40

15:11

00:43

5:17

20:44

1:25

5:28

6:45

6:25

18:07

8:40

6:43

11:01

9:47