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#### Introduction <a id="container.intro.reqmts">[[container.intro.reqmts]]</a>
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In [[container.requirements.general]],
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- `X` denotes a container class containing objects of type `T`,
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- `a` denotes a value of type `X`,
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- `b` and `c` denote values of type (possibly const) `X`,
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- `i` and `j` denote values of type (possibly const) `X::iterator`,
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- `u` denotes an identifier,
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- `v` denotes an lvalue of type (possibly const) `X` or an rvalue of
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type `const X`,
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- `s` and `t` denote non-const lvalues of type `X`, and
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- `rv` denotes a non-const rvalue of type `X`.
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The following exposition-only concept is used in the definition of
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containers:
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``` cpp
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template<class R, class T>
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concept container-compatible-range = // exposition only
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ranges::input_range<R> && convertible_to<ranges::range_reference_t<R>, T>;
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```
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