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Much of the text relies on a knowledge of SAS's macro language. I assume that you know what a macro variable is, how to create one (via call symput or explicit %let statements), and how to create and run macros. If you do not know this, your life will probably be immeasurably improved by learning it. A good place to start is the SUG paper by Delwiche and Slaughter (whom you may remember from The Little SAS Book): Delwiche and Slaughter (2004).
Andre de Souza