explain bd

23:27

25:46

26:55

21:02

26:59

40:47

24:29

21:51

26:50

28:29

36:21

35:30

25:51

18:44

24:55

36:25

30:22

19:49

20:59

16:03

29:33

20:37

22:08

24:46

17:01

25:59

13:02

29:20

9:59

20:57

14:58

38:58

13:42

17:41

26:01

10:05

27:53

24:39

17:56

2:24

11:42

10:32

4:13

9:30

11:55

9:15

11:30

5:05

6:54

11:48

20:57

14:49

18:06

5:06

10:30

41:11

18:33

10:32

19:02

7:27