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> #include <iostream>
>
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< void print(ostream& out) const;
---
> void print(std::ostream& out) const;
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< ostream& operator<<(ostream& out, const Set& obj);
---
> std::ostream& operator<<(std::ostream& out, const Set& obj);
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< ostream& operator<<(ostream& out, const Set& obj)
---
> std::ostream& operator<<(std::ostream& out, const Set& obj)
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< out << flush;
---
> out << std::flush;