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Code developed and tested with SWI-prolog 5.7.11 & 5.10.4 To try example1.pl: * fire up prolog in interactive mode (pl, or swipl command usually) in the same directory as exampleZ.pl and dpj.pl * load example1.pl (remember the colon): ?- ['example1.pl']. exampleZ.pl will also load its dependency, dpj.pl * query the predicate: (a) to find solutions ?- example1(X,Y). (b) to check if a specific solution is valid ?- example1(root, star). (c) to check if given a partial solution, a full solution can be found ?- example1(root, Y). For examples 2 & 3 the procedure is similar, although I recommend you quit and start over the prolog interpreter to purge all the loaded predicates that may interfere from one example to the other. (I'm going to figure out a way to scope this predicates to prevent them from leaking from one example to the other).