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A unless B ∼B→A “A unless B” is a rather complex structure. Though surprisingly we use it with little thought or confusion in our day–to–day speech. To see that “A unless B” is equivalent to “∼B–>A,” consider the following situation: Biff is at the beach unless it is raining. Given this statement, we know that if it is not raining, then Biff is at the beach. Now if we symbolize “Biff is at the beach” as B, and “it is raining” as R, then the statement can be diagrammed as ∼R–>B.
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