• Same rules as hw2 apply.
   
• There is no starter file, and no public autograder this week.  Place your solutions in hw4.py, with your manual solutions (such as to quick answers, code tracing, etc) in a multiline string (""") at the top of the file.  Show your work (in some reasonable fashion).  For tracing, though of course you can just run the code to get the correct answer, you are still (obviously) expected to carefully consider how the code works.
   
• This entire hw is COLLABORATIVE.  You will work in groups of up to 3 other students who are in this course this semester (and then with nobody else except current CA's and instructors).  You may not split up the work -- everyone must work on every problem.  And you may not simply copy any code but rather truly work together.

1. Redo hw3 (except the graphics and the bonus)
   Note:  if someone in the group scored a perfect on hw3 last week, yes they can just resubmit their work, but they should also help others in the group learn the material.  Don't just share answers with each other.  Teach each other.
    

2. Do practice-quiz3 (note: the free response questions will be autograded)
    

3. Do quiz3 (except the bonus) (note: once again, the free response questions will be autograded)
    

4. Do s12-quiz5 #1 (strings portion)
    

5. Do f12's hw4b

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