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Convenince labels added to the top of each file to assist in creating
index-type help files for things like the XML editor screen (where
there's nothing to hook help to).

\label{Variables_in_the_Answer_Block}

You can use variables in the \textbf{Answer} part of the question, too. This
means you can compute an answer to a question, which we'll see in a bit.
If you set the answer of the question to be \textbf{\$variable}, \textbf{Save
Changes} and \textbf{View} it, you'll see that LON-CAPA is now expecting
{}``3.0'' as the answer, plus or minus 5\%.