would be typeset as 1 Abc, 2^{xx} Efg, 3^{yy} Hjk. These problem annotations should be used to describe the source of a problem. For example \prob[\openstax] would mark a problem as coming from the ...
About 2 classes for Chapter 1, 4 classes for Chapter 2, 12 classes for Chapter 3 and 7 classes for Chapter 4.
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