From Jason Turner

[concept.relation]

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+ ### Concept <a id="concept.relation">[[concept.relation]]</a>
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+
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+ ``` cpp
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+ template<class R, class T, class U>
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+ concept relation =
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+ predicate<R, T, T> && predicate<R, U, U> &&
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+ predicate<R, T, U> && predicate<R, U, T>;
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+ ```
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+