could not be included in this one program.   The approach chosen
here   incorporates  graphical  interface  with  text - oriented
learning.  It gives you the benefits of computer  graphics while
the basics are  explained in clear and  understandable language.
The program  itself is  separated into two main parts.  There is
the review  section  and  the  problem  section.  In the problem
section, there are problems with  degrees of  difficulty ranging
from  the  simple to the  challenging.   Every  question  has an
explanation along with the correct answer.  You can  treat these
problems the same you might with examples in your textbook. They
are for your  practice.   I am  releasing a   separate  problems
addition  to  this program.  It will  include  exercises on  all
levels  and  will include  the  correct  answers,  all for  your
practice. The ordering information will appear before you exit.

     My  name is  Dr. Philip Zhao.   I  hold a  Ph.D.  degree in
