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      1 Matrix4i m = Matrix4i::Random();
      2 cout << "Here is the matrix m:" << endl << m << endl;
      3 cout << "Here is m.topRightCorner(2, 2):" << endl;
      4 cout << m.topRightCorner(2, 2) << endl;
      5 m.topRightCorner(2, 2).setZero();
      6 cout << "Now the matrix m is:" << endl << m << endl;
      7