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Fixes duplicate label problem.

    1: \label{Spreadsheet_Op_On_All_Problem_Parts}
    2: Often, there are several parts in a specific problem. For example, a
    3: problem with three parts would have parts 0, 11, 12, and 13. For a
    4: general spreadsheet, it is not often desirable to sum up all of these
    5: parts, while not knowing how many parts there are as the spreadsheet
    6: is written.
    7: 
    8: The spreadsheet has a preprocessor which an expand a symbolic
    9: expression over all symbolic names that fit. The general syntax is
   10: \index{EXPANDSUM} \texttt{[\&EXPANDSUM(VARNAME;expression)]}. 
   11: 
   12: For example, for the above assessment with three parts,
   13: 
   14: \texttt{\&EXPANDSUM(}\texttt{\textbf{PART}}\texttt{;parameter\_}\texttt{\textbf{PART}}\texttt{\_weight{*}stores\_}\texttt{\textbf{PART}}\texttt{\_awarded)}
   15: 
   16: would become
   17: 
   18: \texttt{parameter\_0\_weight{*}stores\_0\_awarded +}~\\
   19: \texttt{parameter\_11\_weight{*}stores\_11\_awarded +}~\\
   20: \texttt{parameter\_12\_weight{*}stores\_12\_awarded +}~\\
   21: \texttt{parameter\_13\_weight{*}stores\_13\_awarded +}~\\
   22: 
   23: where \textbf{bolded text} is used to highlight what the
   24: \texttt{\&EXPANDSUM} function is doing.
   25: In multi-part questions, "tries"\index{tries} is now the average number of tries to
   26: get the parts right. The full data for each part is still stored by
   27: the system. To expand the data and work with all parts, please see
   28: \ref{Spreadsheet_Op_On_All_Problem_Parts}.