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cleanup and formatting with a few clarifications

    1: \label{Numerical_Response_Units}
    2: 
    3: Numerical Response problems can require units. In the problem editing form,
    4: place the desired unit in the \textbf{Unit} field. A complete list of 
    5: units is in the section \ref{Physical_Units}.
    6: The computer will accept the answer in any of its accepted unit formats.
    7: For example, if the answer to a problem is {}``1ft'', the computer will
    8: accept {}``12in'' as correct.
    9: 
   10: Additional units can be defined using the ``customunits'' parameter, which is a comma-separated list of unit conversions. For example
   11: \begin{verbatim}
   12: peck=2*gallon,bushel=8*gallon,gallon=4.4*L
   13: \end{verbatim}
   14: would define the new units peck, bushel, and gallon. The last entry in a conversion chain always needs to be a unit that LON-CAPA already supports.