#include <iostream>
using namespace std;

int main() {

    int i;
        
    while( i <= 5 )
    {
        cout << i << " " << i + 5 << "\n";
        i = i + 1;
    }

    cout << "\n--------\n";

    i = 1;

    while( i <= 7 )
    {
        cout << i << " " << i + 1 << "\n";
        i = i + 2;
    }

    cout << "\n--------\n";

}