goto1+:light*2
goto1
if:light==0thengoto7end ::1=1 ::2=0 ::3=0 ::4=0
if:light==0thengoto7end ::1=0 ::2=1 ::3=0 ::4=0
if:light==0thengoto7end ::1=0 ::2=0 ::3=1 ::4=0
if:light==0thengoto7else ::1=0 ::2=0 ::3=0 ::4=1 goto3 end
::1=0 ::2=0 ::3=0 ::4=0 goto1+:light*2