How did Lady Olenna kill Joffrey?

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Tags

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5. #inadvertently
6. #because
7. #accused
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10. #attached
11. #deliver
12. #fatally
13. #poison
14. #olenna
15. #given
16. #littlefinger
17. #tyrion
18. #murder
19. #delivered
20. #hidden
21. #which
22. #joffrey
23. #worked