#include <iostream>
#include <set>
 
template <typename IT>
void print(IT begin, IT end)
{
    const char* sep = "";
    for (auto it = begin; it != end; ++it) {
        std::cout << sep << *it;
        sep = ",";
    }
}
 
int main()
{
    std::set<int> s{4, 6, 8, 9};
 
    for (auto it = std::next(s.begin()); it != s.end(); ++it) {
        std::cout << "First elements: "; print(s.begin(), it);
        std::cout << ", Rest: "; print(it, s.end()); std::cout << std::endl;   
    }
}

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