Word Count : 193

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In discrete mathematics, a *relation* is a subset of the Cartesian product of two sets. If $A$ and $B$ are two sets, then a relation $R$ from $A$ to $B$ is a set of ordered pairs $(a, b)$, where $a \in A$ and $b \in B$. That is, ______ __________ __________ _______ ______ ____ _________ _________.
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