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The PreTeXt Guide

Subsection 4.13.1 Exercises, Original Versions

In a conversion to HTML, a <hint> to an <exercise> renders nicely in a knowl, right below the exercise statement. For a conversion to /PDF/print, you might wish to display a hint, visibly, as part of the exercise, or you may wish to park the hint in a Hints to Exercises division in the back matter. To control visibility of the components of exercises (and projects) there are twenty switches you can use. See Section 26.4 for more.