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using System;
class MainClass
{
public static int Main ()
{
DataFrame df1 = new DataFrame ();
DataFrame df2 = new DataFrame ();
if (df1 != null)
{
return 1;
}
return 0;
}
public class DataFrame
{
public static bool operator ==(DataFrame df1, DataFrame df2)
{
return df1 is DataFrame;
}
public static bool operator !=(DataFrame df1, DataFrame df2)
{
return !(df1 == df2);
}
}
}
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