I found #pedantle #403 in 95 guesses!
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https://cemantle.certitudes.org/pedantle
I got the end of the third sentence and that really clued me in. I can't even think how you got it in 18 though!
The current cemantle is kicking my butt. I have the #998, 997, 996, and 994, but I'm still stumped.