It's a shame the standard texts are all 20 years old or more than way too heavy mathematically.
A little book for term rewriting would be a great new addition.
Here's a little zine on multiset rewriting(unordered term rewriting), John Conway said(about Fractran in The Book of Numbers) that it is such a simple paradigm of computation that no book is needed to learn it, and it can be taught in 10 seconds.
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