转载自：https://mp.weixin.qq.com/s/cVhuibaXiCuUBTc-dX1Weg
来自微信公众号:人工智能Prolog

We are given the following facts of travel information. Write a Prolog program that can answer the question like : Is it possible to travel from Valmont to Raglan using car, train, plane or their combination? i.e., input the question “travel(Valmont,raglan).” and the system should be able to output either “true” or “false”.
byCar(auckland,hamilton).
byCar(hamilton,raglan).
byCar(valmont,saarbruecken).
byCar(valmont,metz).
byTrain(metz,frankfurt).
byTrain(saarbruecken,frankfurt).
byTrain(metz,paris).
byTrain(saarbruecken,paris).
byPlane(frankfurt,bangkok).
byPlane(frankfurt,singapore).
byPlane(paris,losAngeles).
byPlane(bangkok,auckland).
byPlane(losAngeles,auckland).

大佬会这道题吗？