InterviewSolution
`{(X,y): x, y in R " " y^(2)= x}``{(x,y): y = |x|, x y in R}``{(x,y): x^(2) + y^(2)=1, x, y in R}``{(x, y): x^(2)-y^(2)=1, x, y INR}`
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