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.tex files from help.loncapa.org largely done. Added some lables to
older files. Last mega-massive .tex commit for a while.

\label{Spreadsheet_Lists}
When you have a list of numbers in a cell, how it is displayed depends
on how you seperate the numbers and how Perl interprets the results.

\textbf{35 45 12} will not generate any result because this is an
invalid perl statement.

\textbf{35,45,12} will have a result of 12 because Perl has a comma
operator similar to the comma operator\index{comma operator} in C.

The comma operator is binary and returns the value on its right. Thus
\texttt{\$variable = 15, 26;} assigns \texttt{\$variable} the value
26.  If you need the values to all be displayed, enclose the entire
cell contents in quotes.