for x do 16 times
    if x == 5 then
       drawline(0, 0, 10, 10)
       if 1 == y then
           set_background(4)
       else
           set_background(0)
       end
       y = 1
    else
       set_background(0)
       drawline(100, 100, 120, 120)
    end
end