1 ? "↰":A=1:B=1:FOR Z=1 TO 3:READ X:Y=18:FOR S=1 TO 36:POSITION X,Y:? "*":X=X+A:Y=Y-B
2 IF X<1 OR X>17 THEN A=-A
3 IF Y<1 OR Y>17 THEN B=-B
4 NEXT S:NEXT Z:DATA 3,9,15
