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I'm feeling so dumb right now; I've tried so many Caesar's Cypher combinations for problem 3 and can't seem to find the right answer. Tips?

You could bruteforce all 25 possible keys ... but the key is right next to the Caesar cipher clue.

There are only 25 possible settings for a Caesarean cipher. You may be thinking of a substitution cipher, but the clue indicates a Caesarian cipher, as you correctly figured out. The problem is probably that you're feeding a correct answer in a phrasing that the system will not accept.

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