Why is Temple of Doom a prequel?

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Tags

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2. #internet
3. #found
4. #raiders
5. #before
6. #mythology
7. #volume
8. #prequel
9. #place
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11. #confirmation
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13. #considered
14. #jones
15. #which
16. #three
17. #takes
18. #years
19. #course
20. #indiana