I am about to start reading this book. If you have read it, how do you think it is? If you have not, how much do you think is its efficacy?

I am about to start reading this book. If you have read it, how do you think it is? If you have not, how much do you think is its efficacy?

Apologies for the resolution of the image.

I am about to start reading this book. If you have read it, how do you think it is? If you have not, how much do you think is its efficacy?
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