___DATA___
begin
  loop
    warn('xxx');
  endloop;

  loop
    null;
	  loop
	    warn('AAA');
	  endloop;
  endloop;
  
  loop
	  loop
	    warn('BBB');
	  endloop;
    warn('rrr');
  endloop;

 begin
   loop
   endloop;

    warn('yyy');
 end;

  warn('zzz');
end;