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    It is actually one of the nicest introduction to what Prolog is (not to how to use it).

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      I asked Dr Colmerauer a few years ago if the source code (apparently largely in Fortran) for the original Prolog interpreter still exists, but his belief is that it is lost. :(

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        Unfortunately he passed away in 2017.

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          RIP. A sad thing to hear.

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        I love the illustrations under the Prolog II heading, especially the parse tree drawn on a branch with leaves.

        http://prolog-heritage.org/en/ph21.html

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          I studied AI back when Prolog was predominantly used in European AI research and I still have a soft spot for the language, even if I immediately stopped using it on graduation and wrote video games in C