Minor type corrections in A1, completion of preamble and questions for A2

Assignments/A1/A1.tex

@@ -197,23 +197,24 @@ push any input data files you created for testing purposes.  For Part 1, the
 only files that you should modify are the Python files and the only ``new''
 files you should create are the input data files.  Changing other files could
 result in a serious grading penalty, since the TAs might not be able to run your
-code and documentation generation.  You should NOT sumbit your generated
+code and documentation generation.  You should NOT submit your generated
 documentation (html and latex folders).  In general, files that can be
 regenerated are not put under version control.
 
 After the deadline for submitting your solution has passed, your partner files,
-{\tt SeqADT.py} and {\tt CurveADT.py}, will be pushed to your repo.  The date
-when this will occur is given at the beginning of this assignment description.
+{\tt SeqADT.py} and {\tt CurveADT.py}, will be pushed to your repo.
+\textbf{Including your name in your partner code files is optional.}
 
-\section *{Part 2}
+\section*{Part 2}
 
 \section *{Step \refstepcounter{stepnum} \thestepnum}
 
 After you have received your partner's files, replace your corresponding files
-with your partner's.  Do not make any modifications to any of the code.  Run
-your test module and record the results.  Your evaluation for this step does not
-depend on the quality of your partner's code, but only on your discussion of the
-testing results.
+with your partner's.  Do not initially make any modifications to any of the
+code.  Run your test module and record the results.  Your evaluation for this
+step does not depend on the quality of your partner's code, but only on your
+discussion of the testing results.  If the tests fail, for the purposes of
+understanding what happened, you are allowed to modify your partner's code.
 
 \section *{Step \refstepcounter{stepnum} \thestepnum \label{StepReport}}