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Evaluate each of the following without using a calculator.

`log_(2)(1/2) =`  

 `log_(1/4)(16) =`  

 `log_(10)(-1) =`  

 `log_(1/7)(1/7) =`  

 `log_(64)(4) =`  

 `log_(6)(36) =`  

 `log_(1/4)(1) =`