The set of spheres through the circle S = x^2 + y^2 + 2^2 + 2ux + 2vy + 2wz + d = 0 and S' = x^2 + y^2 + 2^2 + 2u_1x + 2v_1 y + 2w_1z + d_1 = 0 is *
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