0 a=1:b=40:?"{CLR}
1 fOt=.to20:ifx<19tHpO1267+x+y,42:ify>480tHpO1267+x+480-y,42
2 ify>560ory=.tHb=-b
3 x=x+a:y=y-b:nE:a=-a:gO1