1.

\frac { 1 } { \operatorname { log } _ { 4 } ( b c ) + 1 } + \frac { 1 } { \operatorname { log } _ { h } ( c a ) + 1 } + \frac { 1 } { \operatorname { log } _ { c } ( a b ) + 1 } = 1

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