Write a Prolog program with the following knowledge base: directTrain(union-stat

Question

Write a Prolog program with the following knowledge base:

directTrain(union-station, san-bernardino).
directTrain(oxnard, union-station).
directTrain(burbank, lancaster).
directTrain(lancaster, union-station).
directTrain(san-bernardino, riverside).
directTrain(santa-ana, burbank).
directTrain(oceanside, santa-ana).

This knowledge base holds facts about towns you can travel between by taking a direct train, e.g., from union station to san bernardino.

Extend your Prolog program with a rule that adds a directTrain between A and B whenever there is one from B to A.

Explanation / Answer

directTrain(union-station, san-bernardino).
directTrain(oxnard, union-station).
directTrain(burbank, lancaster).
directTrain(lancaster, union-station).
directTrain(san-bernardino, riverside).
directTrain(santa-ana, burbank).
directTrain(oceanside, santa-ana).

directTrainrev(a,b):- directTrain(b,a) // directTrainrev is a rule that adds a directTrain between a and b whenever ther is one from b to a.

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