Is there a rule for tion and Sion?

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1. #permission
2. #ending
3. #commission
4. #discuss
5. #succession
6. #aggression
7. #nouns
8. #impression
9. #always
10. #based
11. #station
12. #discussion
13. #examples
14. #emission
15. #admission
16. #words
17. #expression
18. #comes
19. #permit
20. #pronounced
21. #spelled