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mentions second sorted arg and requirements
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‎README.md‎

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@@ -340,9 +340,15 @@ for (auto&& i : compress(ivec, bvec) {
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sorted
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------
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Allows iteration over a sequence in sorted order. `sorted()` does
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Allows iteration over a sequence in sorted order. `sorted` does
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**not** produce a new sequence, copy elements, or modify the original
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sequence. It only provides a way to iterate over existing elements.
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`sorted` also takes an optional second
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[comparator](http://en.cppreference.com/w/cpp/concept/Compare)
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argument. If not provided, defaults to `std::less`. <br />
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Iterables passed to sorted are required to have an iterator with
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an `operator*() const` member.
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The below outputs `0 1 2 3 4`.
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```c++

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