[x*y=0,(x-4)^2 (y 2)^2=16,(x 1/2)^2 (y-1/4)^2=1/4,(x-1/2)^2 (y 1/4)^2=1/4][x*y=0,(x-4)^2 (y 2)^2=16,(x 1/2)^2 (y-1/4)^2=1/4,(x-1/2)^2 (y 1/4)^2=1/4]

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