4.1.5 Line of Increasing Blocks

penup()
backward(150)
pendown()
def repeat_squares():
    for i in range(1):
        forward(10)
        left(90)
        forward(10)
        left(90)
        forward(10)
        left(90)
        forward(10)
        left(90)
        penup()
        forward(20)
        pendown()
repeat_squares()
forward(20)
left(90)
forward(20)
left(90)
forward(20)
left(90)
forward(20)
left(90)
penup()
forward(40)
pendown()

forward(30)
left(90)
forward(30)
left(90)
forward(30)
left(90)
forward(30)
left(90)
penup()
forward(60)
pendown()

forward(40)
left(90)
forward(40)
left(90)
forward(40)
left(90)
forward(40)
left(90)
penup()
forward(80)
pendown()

forward(50)
left(90)
forward(50)
left(90)
forward(50)
left(90)
forward(50)
left(90)
penup()
forward(100)
pendown()