#include <fstream>
using namespace std;
ifstream in("submultimi.in");
ofstream out("submultimi.out");
int n,a[20],m;
void scrie(int x){
    for(int i=1;i<=x;i++)
        out<<a[i]<<" ";
    out<<'\n';
        }
void back(int k){
    int i;
    for(i=a[k-1]+1;i<=n;i++){
        a[k]=i;
        scrie(k);
        if(k<n)
            back(k+1);}
}
int main(){
    in>>n>>m;
    back(1);
    return 0;}