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$x^2 + y^2 - 2x - 6y + 1 = 0$
$x^2 + y^2 - 2x - 6y + 1 = 0$
- $x^2 + y^2 - 2x - 6y + 1 = 0$
- $x^2 + y^2 - 2x - 6y + 1 = 0$ (correct)
- $x^2 + y^2 - 2x - 6y + 1 = 0$
- $x^2 + y^2 - 2x - 6y + 1 = 0$