How do I combine PDF files for free?

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Tags

1. #above
2. #merge
3. #order
4. #press
5. #buttons
6. #desired
7. #document
8. #click
9. #multiple
10. #select
11. #single
12. #files
13. #download
14. #choose
15. #button
16. #upload
17. #online
18. #combine