stepbystepcontouringmethod

4:43

2:10

23:57

8:49

13:58

7:27

13:58

6:23

13:35

6:00

7:46

4:56

13:42

10:05

11:30

14:33

13:55

16:47

12:13

12:45

15:38

8:51

8:53

12:45

9:44

12:49

2:39

4:55

4:13

1:33

4:20

3:14

5:58

4:49

1:43

6:49

2:17

5:00

3:07

1:26