How do I restore my IMAC to factory settings without CD?

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Tags

1. #choose
2. #partition
3. #utility
4. #prompts
5. #command
6. #reset
7. #click
8. #computer
9. #factory
10. #connect
11. #network
12. #select
13. #restart
14. #while
15. #reboots
16. #continue
17. #recovery
18. #option