I am very puzzled by the previous review. I bought the book exactly for the same reasons and it explained everything carefully. More important, it described options that I did not realize existed. I originally had the 3rd edtion and was so impressed with it, that I bought the 4th. However, the difference between the two is very little, so buy the cheaper for the two. I have not seen the the 1st and the 2nd edition so I cannot comment on them.
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