private static void createCase5( String filename ) throws IOException{
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("new sheet");
sheet1.groupColumn( (short)2, (short)10 );
sheet1.groupColumn( (short)4, (short)7 );
sheet1.setColumnGroupCollapsed( (short)4, true );
sheet1.setColumnGroupCollapsed( (short)2, true );
sheet1.setColumnGroupCollapsed( (short)4, false );
sheet1.setColumnGroupCollapsed( (short)3, false );