It's a good $7 investment. I don't like it as well as the (Demetriou) Rules Study Guide because I like the quiz/test portions of the Study Guide and I find it easy to follow.
As I've mentioned in some of my articles, there is value in looking at the rules from a different perspective/orientation. It gives you a little different look and, at least for me, that helps reinforce the rules.
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kentref
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