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#include <iostream>
#include <fstream>
using namespace std;
int s[102],n,v[102];
void afis()
{
int k=0;
for(int i=1;i<=n;i++)
if(s[i])
k++;
if(k==0)
return;
for(int i=1;i<=n;i++)
if(s[i])
cout<<v[i]<<" ";
cout<<'\n';
}
void bk(int k)
{
if(k>n)
{
afis();
return;
}
s[k]=0;
bk(k+1);
s[k]=1;
bk(k+1);
}
int main()
{
ifstream cin("submultimi.in");
ofstream cout("submultimi.out");
cin>>n;
for(int i=1;i<=n;i++)
cin>>v[i];
bk(1);
return 0;
}