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

main()
{
        MSet<int> mset1;

        for (int i=0; i<3; i++) 
                mset1.insert(i);
        mset1.insert(0);

        Set<int> set1(mset1);

        if (mset1 != set1)
                cout << "(" << mset1 <<" != " << set1 << ")" << endl;

        if (mset1 <= set1)
                cout << "(" << mset1 <<" <= " << set1 << ")" << endl;

        if (mset1 < set1)
                cout << "(" << mset1 <<" < " << set1 << ")" << endl;
}
\end{verbatim}

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\begin{verbatim} 
({0 0 1 2} != {0 1 2})
({0 0 1 2} <= {0 1 2})
({0 0 1 2} < {0 1 2})
\end{verbatim}

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