QuestionQuestion

Assignment 4
Programming Languages

Question 1: Train Travel

We have the following knowledge base:
nonStopTrain(sandiego,oceanside).
nonStopTrain(lasvegas,sandiego).
nonStopTrain(sanfrancisco,bakersfield).
nonStopTrain(bakersfield,sandiego).
nonStopTrain(oceanside,losangeles).
nonStopTrain(portland,sanfrancisco).
nonStopTrain(seattle,portland).

This knowledge base holds facts about towns it is possible to travel between by taking a non-stop train. We can travel further by `chaining together' non-stop train journeys.
Write a recursive predicate routeTrip/3 that tells us whether we can travel by train between two towns, and the route taken.

For example, when given the query
?- routeTrip(seattle,oceanside, Trip).
Trip = [seattle, portland, sanfrancisco, bakersfiled,
sandiego, oceanside] .
Also, encode a relationship to express that travel can happen in both directions: A to B, and B to A.
?- canTravel(oceanside,seattle).
`yes'.

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nonStopTrain(sandiego,oceanside).
nonStopTrain(lasvegas,sandiego).
nonStopTrain(sanfrancisco,bakersfield).
nonStopTrain(bakersfield,sandiego).
nonStopTrain(oceanside,losangeles).
nonStopTrain(portland,sanfrancisco).
nonStopTrain(seattle,portland).

% we can travel from...

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train.pl.

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