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Evaluate each of the following without using a calculator.

`log_(2)(16) =`  

 `log_(1/2)(8) =`  

 `log_(16)(2) =`  

 `log_(6)(1/6) =`  

 `log_()(1) =`  

 `log_(2)(-1) =`  

 `log_(1/9)(1/9) =`