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\begin{verbatim}
#include<iostream.h>
#include<LINK/graph/UBinGraph.h>

main()
{
        UBinGraph g;
        Set<Vertex*>       s;
        Vertex *v1, *v2;

        v1 = g.addVertex("v1");
        v2 = g.addVertex("v2");
        s.append( v2); s.append( v1);   // must obey sorted order
        g.addEdge(s);
        cout << g << endl;

        UBinGraph g2(g);        // graph attributes other than "name" are 
                                // not copied.
        g2.addVertex("v3");
        cout << g2 << endl;
}
\end{verbatim}

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\begin{verbatim} 
{[v1 v2]  {{v1 v2}}}
{[v1 v2 v3]  {{v1 v2}}}
\end{verbatim}

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