def shape(){
right(20,200)
left(20, 200)
right(90)
forward(50)
right(90)
right(20,200)
left(20, 200)
right(90)
forward(50)
right(90)
}
def block(){
shape()
right(20)
}
cleari()
setBackground(white)
setPenColor(black)
setAnimationDelay(0)
repeat(18) {
block()
}