As announced in class you can work and turn in any of the cases
in Text Problem 9.2.7 that were not part of Project 4 (i.e. 
Problem 9.2.7 (c,e,f)). That can also include case b, if you did not 
do it previously when you turned in Project 4. You can accumulate at
most 20 points this way (each case b,c,e,f worth 5-but you cannot do b again
if you already turned it in!) to make up for lost points on your grades for
projects 1-4.