how to combine two pdfs

3:17

2:37

4:08

2:53

2:03

3:09

4:36

4:05

14:41

6:00

5:27

56:33

56:33

11:44

32:01

1:20

6:22

3:17

6:20

4:08

8:46

2:53

2:20

15:08

کوتاه

8:17

3:00

کوتاه

58:47

1:45

4:34

1:18

9:16

11:05

1:15

6:06

2:16

6:28

8:17

10:32