z=4 if :wc and :ws==4 then goto2 else goto1 end
if:wc==0 or :ws!=4 thengoto1else :ra1=c :ra3=c :ra5=c :ra7=c end
ifb==1 thenc+=4 elsec-=1end ifc>z thenb=0 end ifc<-4 thenb=1end goto2