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import turtle
turtle.bgcolor ('grey')
t1 = turtle.Turtle()
t1.up()
t1.setpos(-199,20)
t1.down()
t1.circle(15)
t2 = turtle.Turtle()
t2.up()
t2.setpos(-199,20)
t2.down()
t2.circle(30)
t3 = turtle.Turtle()
t3.up()
t3.setpos(-199,20)
t3.down()
t3.circle(45)
t4 = turtle.Turtle()
t4.up()
t4.setpos(-199,20)
t4.down()
t4.circle(60)