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I started with the first word with words of the form ABCDCD. I had curara as one of my 20 or so first words, but I couldn't find an English word of the format _ u c u _ _ _ as the last word so I abandoned it.
I sent the challenge to a few buddies and one of them (a computer engineer) came up with this in his email response:
"A Vigenere cipher. (Where you have a multi-letter key -- in this
case, two letters -- which repeats through the message, giving varying
shifting amounts for each message letter. I just happened to be reading about these a couple months ago; that's the only reason I know the name.) I swear, one of my first thoughts was that it might be a Vigenere, except I thought maybe the bolded/regular letters were message/key or vice versa, but that didn't produce anything, so I sort of gave up. I wasn't sure how clever it was trying to be...guess I overshot.
I focused on the fourth (i.e. two-letter) word, figuring that one of
them had to be a vowel, which drastically narrowed down my search space.
After that, I just did a brute force search, using an online Vigenere
cipher encoding/decoding tool to give me the result of each try.
Just a few tries before I got it, I was trying key QX, which gave me:
ciroro cwtc tits eh jicinre
That made me laugh. Then, a few tries later I hit key QL, and I figured that had to be it -- was the first one where every word was at least pronounceable. Couple googles later, and I was sure."
You can try the cipher here
http://sharkysoft.com/misc/vigenere/
Paste the puzzle in the first box and the key is QL. Bingo bango, sugar in the gas tank.
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