Matrix4i m = Matrix4i::Random();
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cout << "Here is the matrix m:" << endl << m << endl;
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cout << "Here is m.topLeftCorner<2,2>():" << endl;
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cout << m.topLeftCorner<2,2>() << endl;
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m.topLeftCorner<2,2>().setZero();
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cout << "Now the matrix m is:" << endl << m << endl;
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