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I already did that (twice in Zed's route) and repeated it. I see the book, then it reads that Yoshi doesn't find anything interesting and moves it back to the cover page. Is there any way for me to trigger the CG? Did I miss any action between Yoshi and Zed?

Hm.. finished all CG's EXCEPT the buggy Ship layout one and the Zaurian Anatomy(Male) one. 

Did anyone achieve the Zaurian Anatomy CG yet? How to obtain it? That's the only CG that I don't have yet. Thank you in advance!