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      1 RowVector4i v = RowVector4i::Random();
      2 cout << "Here is the vector v:" << endl << v << endl;
      3 cout << "Here is v.tail(2):" << endl << v.tail(2) << endl;
      4 v.tail(2).setZero();
      5 cout << "Now the vector v is:" << endl << v << endl;
      6