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2. Write a program to draw this. Assume the innermost square is 20 units per side, and each successive square is 20 units bigger, per side, than the one inside it.
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import turtle
wn = turtle.Screen()
wn.bgcolor("lightgreen")
tess = turtle.Turtle()
def draw_square(t,size):
for i in range(4):
tess.forward(size)
tess.left(90)
size = 20
for j in range(3):
tess.pensize(3)
draw_square(tess,size)
size = size + 20
tess.penup()
tess.goto(-20, -20)
tess.pendown()
wn.mainloop()