Wow it must be difficult reading books in a different language. I don't have the diamond medal yet, but I have gold on nearly all the individual parts (except for the Handy Traveler Medal) so I can still try to help you. I've solved all of the book puzzles, and nearly all the puzzles for the cards I have as well. I'm currently learning Spanish, although I havent gotten very far yet. I'm still reading the first seven wonders book as well, although I've taken a break from it to read flashpoint.I started reading t39c because of Rick Riordan too! I've been reading the 39c books for 3 years this winter, and have been keeping up with the MB for 2 (although I only started posting last year) so I'm an old timer when it comes to this series.
I'm sorry about the delay in replying.
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39 is sweet number. It's 13 times 3. It's also the sum of 5 prime numbers in a row — 3, 5, 7, 11, 13. And if you add the first 3 powers of 3, 3^1 plus 3^2 plus 3^3 you get 39.