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So I'm going to ask you something. Which is if

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we consider again our function print sum, the one

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that takes two integers and prints the sum. How

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long would it take to exhaustively test this function? And

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this is a very simple one. There's just two

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inputs, right? So we can just enumerate them all.

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And put them throw them at the computer form,

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and wait for the results. How long would that take?