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changed wording for clarity and consistency

\label{String_Response_Problems}

\textbf{\index{String Response}String Response} problems allow the student to submit a string of characters for the answer. Examples
of String Response questions are vocabulary tests, short answers and chemical formulas.

Note that it is easy to abuse String Response problems. For instance, consider
the question {}``Who wrote 'Huckleberry Finn'?'' If you tell the system
the answer is {}``Mark Twain'', and a student answers {}``Twain'', the
system will mark it wrong. If they answer {}``Samuel Clemens'', then the
student will definitely get it wrong. There is some room for flexibility
in the string processing, but it can be difficult to get it all correct. Before
you use a String Response problem, be sure you can easily characterize correct
answers.
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