If \( a=\log _{4} 5 \) and \( b=\log _{5} 6 \), then the value of \( 2 a b-\log _{2} 3 \).

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If \( a=\log _{4} 5 \) and \( b=\log _{5} 6 \), then the value of \( 2 a b-\log _{2} 3 \).
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