bob = Turtle(world)

fd(bob, 40)
lt(bob)
fd(bob, 40)
rt(bob)
fd(bob, 40)
lt(bob)
fd(bob, 40)
rt(bob)
fd(bob, 40)
lt(bob)
fd(bob, 40)
rt(bob)
fd(bob, 40)
lt(bob)
fd(bob, 40)

lt(bob)

fd(bob, 40)
lt(bob)
fd(bob, 40)
rt(bob)
fd(bob, 40)
lt(bob)
fd(bob, 40)
rt(bob)
fd(bob, 40)
lt(bob)
fd(bob, 40)
rt(bob)
fd(bob, 40)
lt(bob)
fd(bob, 40)