How do I get out of fullscreen in Ubuntu?

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Tags

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2. #reason
3. #chrome
4. #doesn
5. #press
6. #leave
7. #image
8. #ubuntu
9. #programs
10. #google
11. #click
12. #firefox
13. #typical
14. #terminal
15. #button
16. #viewer
17. #screen
18. #answer
19. #right