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`{(x, y): x^2 = 4y} uu {(x, y): y le0}``{(x, y): x^2 + (y- 1)^2=4} uu {(x, y): y le0}``{(x, y): x^2 = y} uu {(0,y) : y le0}``{(x, y): x^2 = 4y}uu {(0,y) : y le0}`.