#include <fstream>

using namespace std;

ifstream in ("submultimi.in");
ofstream out ("submultimi.out");

int i,n,x,j,a[17];

int main()
{
    in>>n;
    for(i=1; i<=n; i++)
    in>>a[i];

    for(i=1; i<=(1<<n); i++)
    {
        x=i;
        for(j=1; j<=n; j++)
        {
            if(x%2==1) out<<a[j]<<" ";
            x/=2;
        }
        out<<endl;
    }

    return 0;
}