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{"ops":[{"insert":"You are to write a simple program in Prolog to find a path through a maze. Your input will consist of facts of the form\n    pway(a, b, 10)."},{"attributes":{"code-block":true},"insert":"\n"},{"insert":"indicating that there is a passageway from intersection\u00a0a\u00a0to intersection\u00a0b\u00a0of length 10 meters. You are to write a rule\n    solve(X, Y, P, N) :- ..."},{"attributes":{"code-block":true},"insert":"\n"},{"insert":"that will find a path\u00a0P\u00a0of length\u00a0N\u00a0(if one exists) from intersection\u00a0X\u00a0to intersection\u00a0Y. The intent is that the user will invoke\u00a0solve\u00a0as a query, specifying\u00a0X\u00a0and\u00a0Y\u00a0as constants and\u00a0P\u00a0and\u00a0N\u00a0as variables.\nHere is a concrete example. Suppose the database contains the following rules:\n    pway(a, b, 10)."},{"attributes":{"code-block":true},"insert":"\n"},{"insert":"    pway(b, c, 15)."},{"attributes":{"code-block":true},"insert":"\n"},{"insert":"    pway(d, c, 5)."},{"attributes":{"code-block":true},"insert":"\n"},{"insert":"    pway(d, b, 10)."},{"attributes":{"code-block":true},"insert":"\n"},{"insert":"If the user types\n    solve(a, d, P, N)"},{"attributes":{"code-block":true},"insert":"\n"},{"insert":"the Prolog interpreter might respond with\n    P = [a, b, c, d]"},{"attributes":{"code-block":true},"insert":"\n"},{"insert":"    N = 30"},{"attributes":{"code-block":true},"insert":"\n"},{"insert":"\n"}]}

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