clear
setPenColor(black)
setFillColor(blue)
setBackgroundH(red,blue)
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)