# setup steps: no need to change for now
import turtle               # allows us to use the turtles library
wn = turtle.Screen()        # creates a graphics window
alex = turtle.Turtle()      # create a turtle named alex

# action steps: draw two squares of different sizes
# define how to draw a square of any given size
def square (alex, size):
    alex.forward(size)      # tell alex to move forward by “size” units
    alex.left(90)           # turn by 90 degrees
    alex.forward(size)
    alex.left(90)
    alex.forward(size)
    alex.left(90)
    alex.forward(size)
    alex.left(90)


# now, use a loop to draw a pattern of squares
for n in range(18):
    square(alex, 100)
    alex.left(20)