Suppose some dark night a policemanwalks down a street, apparently deserted. Suddenly he hears a burglar alarm, looks across the street, and sees a jewelry store with a broken window. Then a gentleman wearing a mask comes crawling out through the broken window, carrying a bag which turns out to be full of expensive jewelry. The policeman doesn’t hesitate at all in deciding that this gentleman is dishonest. But by what reasoning process does he arrive at this conclusion? Express it in terms of simple propositions like if A is true, then B… .

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