hello-world/App.class hello-world/App.java hello-world/App.java import com.groupdocs.viewer.Viewer; import com.groupdocs.viewer.options.HtmlViewOptions; public class App { public static void main(S......3,1 Cell 3,2 Cell 3,4 Two horizontal cells are merged together...Cell 4,4 Cell 5,1 Merged 3 horizontal and 3 vertical cells (align...