text: #include "prime.h"
  #include <iostream>
  
  
  int main() {
      auto limit =0u;
      std::cout << "Enter in your limit: ";
      std::cin >> limit;    
      auto primes = sieve(limit);
      std::vector<std::pair<unsigned int, unsigned int>> out;
      for(auto prime = primes.begin(); prime < primes.end(); ++prime) {
          for(auto candidate = prime+1; candidate < primes.end(); ++candidate) {
              if(*candidate == *prime + 6) { 
                  out.emplace_back(*prime, *candidate);
              }
              if(*candidate > *prime + 6) {
                  break;
              }
          }   
      }
  
      for(auto p: out){
          std::cout << p.first << " " << p.second << "\n";
      }
  
      return 0;
  }