If exactly two real common tangents can be drawn to the circles $x^2+y^2-2x-2y=0$ and $x^2+y^2-8x-8y+\lambda=0$ then
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If exactly two real common tangents can be drawn to the circles $x^2+y^2-2x-2y=0$ and $x^2+y^2-8x-8y+\lambda=0$ then