Yeah thats what it is macro preprocessing hehe.
I'm lazy and like macros, I learned about m4 after abusing the cpp preprocessor for other things. Sometimes I don't know what number to put at the moment (or I don't care because there exists some order), which I can define in m4 syntax. Then I would like to just run m4 on the document for it to be preprocessed and edit it slightly for formating and I'm done yeay.
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