Accesing 2dimension set

How to print all elements of 2-dimensional set created here?

int i, j, n;
set< set<int> > st;
set< set<int> > ::iterator it;
for(i=0;i<5;i++)
{
    set<int>row;
    for(j=0;j<5;j++)
    {
        cin>>n;
        row.insert(n);
    }
    st.insert(row);
}