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Evaluate each of the following without using a calculator.

`log_(3)(1/3) =`  

 `log_(8)(2) =`  

 `log_(1/4)(1/4) =`  

 `log_(9)(81) =`  

 `log_(1/9)(81) =`  

 `log_(1/2)(1) =`  

 `log_(8)(-1) =`