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  • Users: everlonggg
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  1. everlonggg

    'fail' predicate confusion

    The fail predicate seems a bit unpredictable under certain cases to me. Take the following example. Code: a(1). a(2). b(3). b(4). go:- a(X), write(X). go:- a(X), write(X), b(Y), write(Y). Query this with ?- go, fail. The result is 12134234. How does this make sense? Can somebody explain the...

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