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int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    qmlRegisterType<A>("test.test.A", 1, 0, "A");
    qmlRegisterType<B>("test.test.A", 1, 0, "B");
    qmlRegisterType<C>("test.test.A", 1, 0, "C");

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/qml/desktop/main.qml")));

    return app.exec();
}