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x^2+y^2=(R-a)^2,(x-a/2)^2+y^2=R^2,x^2+y^2=R^2+a^2/4
x^2+y^2=(R-a)^2,(x-a/2)^2+y^2=R^2,x^2+y^2=R^2+a^2/4
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