#include <iostream>
#include <set>
#include <string>
int main()
{
std::set<std::string> set={ "aaa", "bbb", "ccc", "ddd", "eee", "fff" };
size_t a = 1, b = 4;
auto it = set.begin(), it_end = set.begin();
std::advance(it, a);
std::advance(it_end, b);
for(; it!= it_end; ++it)
std::cout << *it << " ";
}
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