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\begin{verbatim}
#include<iostream.h>
#include<LINK/basic/Array.h>
#include<LINK/basic/Set.h>
#include<LINK/graph/BinGraph.h>


main()
{
        BinGraph g;
        MSet<Vertex*> s;
        Set<Vertex*>  s2;
        Vertex *v1, *v2;

        v1 = g.addVertex("v1");
        v2 = g.addVertex("v2");
        s.insert(v2); s.insert(v1); s.insert(v1);
        s2 = s;
        g.addEdge(s);
        g.addEdge(s2); 
        cout << g << endl;
}
\end{verbatim}

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\begin{verbatim} 
{[v1 v2]  {{v1 v2}}}
\end{verbatim}

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