chapter 7 exercise 71

4:20

3:23

9:10

3:58

6:33

4:32

3:25

1:40:24

36:31

35:24

9:57

16:50

13:57

47:35

36:44

1:01:13

1:36:26

23:57

1:08:01

1:35:38

12:54

33:47

3:04:24

11:00

7:33

39:06

4:27

18:06

1:11:24

3:26

12:13

6:09

56:32

36:05

23:59

54:50

2:05

4:40

3:20

37:23

2:16

13:36

5:39

16:03

6:57

19:11

3:42

16:34

32:06

9:08

48:29

20:49

46:31

8:34

30:54

9:32

25:41

1:07:34

4:45:31

9:52