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If you have studied poker some, there's really no reason not to dive right into 7CS4AP. If you can't grasp it, I don't really like your chances of beating the game anyway.

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Not reading 7CS4AP first would not be because he would not "grasp" the material, but some of the material is worthless at beginner limits. You could know 7CS4AP inside out and not beat the game at some limits. 7CS4AP has lots of discussion on making raises to eliminate the number of opponents in the hand. That is a joke in some games as some people will never fold at the lower limits until their hand is definitely beat. Starting off with a medium limit book would not be a bad idea.