find parallel lines

4:34

5:36

5:04

4:24

1:57

5:25

4:11

3:59

6:44

8:00

5:07

2:46

5:00

13:27

5:46

3:43

7:07

2:31

10:37

41:56

5:20

4:41

2:16

6:12

4:15

11:49

3:53

2:33

33:34

6:29

2:26

11:39

6:40

2:35

5:23

11:06

5:12

9:35

2:07

3:24

4:26

26:09

2:48

8:53

2:58

2:15

3:03

7:01

6:24

2:11

6:03

7:19

9:41

10:26

5:40

7:01

11:14

7:09

5:23

23:07