simplification and approximation

1:57:46

54:46

1:17:14

3:29:01

1:37:01

51:20

19:19

1:50:04

56:23

18:39

1:30:38

55:35

57:26

57:01

50:26

2:00:25

3:51:23

1:33:51

54:15

46:14

56:45

46:39

13:47

10:11

43:40

1:22:47

47:26

2:36:30

19:27

51:25

1:23:13

54:42

1:08:52

50:57

3:01:03

32:41

1:25:20

59:21

52:30

56:26

1:11:11

59:15

1:16:29

50:46

29:47

41:11

51:06

56:53

54:26

1:34:10

57:01

1:45:22

48:47

2:21:33

2:34:37

55:13

26:27

2:41:56

1:57:58

32:28