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(x+1)^2+y^2=2; x^2+(y+1)^2=2; x^2+(y-1)^2=2; (x-1)^2+y^2=2; x^2+y^2=1
(x+1)^2+y^2=2; x^2+(y+1)^2=2; x^2+(y-1)^2=2; (x-1)^2+y^2=2; x^2+y^2=1
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