#include<bits/stdc++.h> using namespace std; int main(){ cout<<"4 6"<<endl; cout<<"4 6 7"<<endl; cout<<"4 6 7 7"<<endl; cout<<"4 7"<<endl; cout<<"4 7 7"<<endl; cout<<"6 7"<<endl; cout<<"6 7 7"<<endl; cout<<"7 7"; return 0; }