1 FOR i=0 TO 35: 
  PRINT AT 3-i-(((21-i)*2) AND i>21),18-i;"*";
        AT 15-i-(((33-i)*2) AND i>33),18-i;"*";
        AT 9-i-(((27-i)*2) AND i>27),18-i;"*": 
  NEXT i
