What are the pitching rules in MLB?

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2. #professional
3. #therefore
4. #rests
5. #which
6. #sequence
7. #these
8. #rotation
9. #baseball
10. #starting
11. #three
12. #another
13. #pitching
14. #their
15. #teams
16. #pitcher
17. #before
18. #after
19. #pitch
20. #pitchers
21. #known
22. #rosters