#include <fstream>

using namespace std;
ifstream f("submultimi.in");
ofstream g("submultimi.out");
int n,i,x,a[1000],j;
int main()
{
    f>>n;
    for (i=1;i<=n;i++) f>>a[i];
    for (i=1;i< (1<<n);i++)
    {
        x=i;
        for(j=1;j<=n;j++)
        {
            if (x%2==1) g<<a[j]<<" ";
            x=x/2;
        }
        g<<'\n';
    }
    return 0;
}