text: #include <iostream>
  #include <QVector>
  #include <QString>
  #include <cassert>
  using namespace std;
  
  int main ()
  {
      QVector<QString> list;
      list << "D" << "E";
      assert(list.size() == 2);
      assert(list.at(0) == "D");
      assert(list.at(1) == "E");
    return 0;
  }
  