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_z = f (x, y) = Roof takes shape of 1 + +xy, x>0Ay> 0 X Y and then it rains. At which points

_z = f (x, y) = Roof takes shape of 1 + +xy, x>0Ay> 0 X Y and then it rains. At which points on the roof are holes drilled so that all the water drains away?

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