I wrote it with the intention of explaining to a complete beginner from scratch that it would be good if it could become a manual for beginners to modify. I would be happy if those who understand the modification to some extent could use it as a textbook when teaching beginners.
This book is distributed under CC0. If you want to help a beginner change, redistribute or whatever! (I would appreciate it if you could let me know if you are going to redistribute it widely ......) https://creativecommons.org/share-your-work/public-domain/cc0/
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