Why did Dr Pulaski replace Dr Crusher?

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1. #doctor
2. #writing
3. #third
4. #departed
5. #character
6. #season
7. #berman
8. #staff
9. #pulaski
10. #after
11. #muldaur
12. #second
13. #diana
14. #replaced
15. #brought
16. #beverly
17. #crusher
18. #hurley
19. #first
20. #mcfadden
21. #series
22. #katherine