using namespace Graph_lib;
    Point t1{100, 100};
    Simple_window window{t1, 600, 460, "My window"};

    std::vector<Graph_lib::Rectangle> Rectangles; // mora ici iz std_lib_facilities.h

    bool red = true;
    for (int i = 0; i < 3; i++)
    {
        int offset_x = 0;
        int offset_y = i * 100;
        for (int j = 0; j < 3; j++)
        {
            Graph_lib::Rectangle rect{Point{100 + offset_x, 100 + offset_y}, 100, 100};
            if (red == true)
            {
                rect.set_color(Color::red);
            }
            else
            {
                rect.set_color(Color::white);
            }
            Rectangles.push_back(rect);
            offset_x += 100;
            red = !red;
        }
        offset_x = 0;
    }
    for (int i = 0; i < Rectangles.size(); i++)
    {
        window.attach(Rectangles[i]);
    }
    window.wait_for_button();