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Define g, h: {x€R2} |x| ≤ 1} →R by

g(x,y) = (x,y, √1-x2-y2),

h(x,y) = (x,y, - √1-x2-y2),

g(x,y) = (x,y, √1-x2-y2),

h(x,y) = (x,y, - √1-x2-y2),

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