What is the difference between permutation and combination?

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1. #groups
2. #called
3. #would
4. #correct
5. #matters
6. #matter
7. #really
8. #numbers
9. #permutations
10. #lists
11. #accept
12. #combinations
13. #should
14. #order
15. #doesn
16. #permutation
17. #combination