Sections 9.1.1 and 9.1.2 done.
Section 9.1.3 done.
Section 9.2.1 done.
Section 9.2.2 done.
Section 9.2.3 done.
Section 9.3.1 Done
Section 9.3.2 Done
Section 9.3.3 done.
Section 9.3 done.
Section 9.4.1 done
Section 9.4.1 Done
Section 9.4 done
Exercise 9.6.1 Done
Exercise 9.6.2 Done
Exercise 9.6.3 Done
Exercise 9.6.4 Done
Exercise 9.6.5 Done
Exercise 9.6.6 Done
Exercise 9.6.7 Done
Exercise 9.6.8 Done