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OFF TOPIC QUESTIONS ARE NOT SUPPORTED! Read “Discuss this ${blog}” (http://meta.programmers.stackexchange.com/q/6417). Originally meant for questions about what influential or famous people have said about programming.

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What did Alan Perlis mean regarding the ways to write error-free programs?

It means there are really no error-free programs. A profound quote about ways to avoid errors with an error itself is parody.
Jesse C. Slicer's user avatar