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= 5^(1/2)log2^5 . 2^(1/2)log7^2 . 7log5^2
= 5/(1/2) . 5log2 . 2/(1/2) 2log7 . 2 . 7log5
= 10 . 4 . 2 . 5log2 . 2log7 . 7log5
= 80