I don’t believe I wrote in the book. If you look at the the second picture there’s a couple divits on the the front. And if you look at the third picture you’ll see that there’s the front pages ripped. I’m not really sure what happened there. I did not scratch off the the extra stuff that you can get from using the code. Otherwise, it may have some highlighting in it. I don’t think it does. But it’s a really great reference. Thanks for looking. Let me know if you have any questions.