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4 - (5/6)^(4/5)^(3/4)^(2/3)^(0.5)^(4/5)^(3/4)^(2/3)^(3/4)^(8/9)^(9)^(8/9)^(2/3)^(3/4)^(4/5)^(8)^(1/2)
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