clear()
setBackground(blue)
setFillColor(yellow)
forward(100)
right(90)
forward(100)
right(90)
forward(100)
left(90)
forward(100)
right(90)
forward(100)
right(90)
forward(100)
left(90)
forward(100)
right(90)
forward(100)
right(90)
forward(100)
left(90)
forward(100)
right(90)
forward(100)
right(90)
forward(100)