Hello,
I use Prolog programming daily in my regular employment.
Thanks for your Prolog program to review. I will add programming notes as documentation to the [login to view URL] Prolog program to assist your understanding. I shall not assume you have even a basic understanding of how Prolog programs function. Btw, a clue to deciphering the programmers' code is that their native language is German. Hence, some of their predicate (Prolog functions) and variable names would make more sense when translated.
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Alan Idler
Chief Software Architect
Idleswell Software Creations