How does the Reddit upvote system work?

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Tags

1. #reddit
2. #submission
3. #score
4. #downvote
5. #their
6. #determine
7. #downvotes
8. #logged
9. #upvotes
10. #appearing
11. #between
12. #change
13. #after
14. #items
15. #upvote
16. #minus
17. #number
18. #arrows