left(90)
for i in range(3):
    forward(20*10)
    right(90)
    forward(4*10)
    right(90)
for i in range(3):
    forward(6*10)
    right(90)
    forward(13*10)
    right(90)
for x in range (-100, 100):
        for y in range(-100, 100):
            setpos(x*10, y*10)
            dot(4, 'gray')
done