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plot ((x-8)/2)^2 - ((y+8)/9)^2 = 1, ((y+8)/2)^2 - ((x-8)/9)^2 = 1
plot ((x-8)/2)^2 - ((y+8)/9)^2 = 1, ((y+8)/2)^2 - ((x-8)/9)^2 = 1
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