How can I tell if my Ubuntu is 32 or 64 bit?

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1. #lib32
2. #running
3. #detail
4. #software
5. #center
6. #details
7. #system
8. #settings
9. #search
10. #whether
11. #processor
12. #including
13. #version
14. #ubuntu
15. #section
16. #under
17. #every