Why do European toilets have 2 buttons?

Related questions

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3. Why do European toilets have no seat?
4. Why is toilet called khazi?
5. Why is toilet paper in France pink?
6. Why are European toilets different?
7. Why do the British call the bathroom the loo?
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Tags

1. #equipped
2. #choose
3. #toilets
4. #buttons
5. #usually
6. #settings
7. #liquid
8. #users
9. #water
10. #about
11. #larger
12. #these
13. #allows
14. #lever
15. #designed
16. #smaller
17. #between
18. #waste
19. #solid
20. #called
21. #flush
22. #double