Homework 4 socket open

[Subbarao Kambhampati <rao@asu.edu>]

Folks
  I opened the socket on homework 4 and added two questions. I plan 
to add questions on semantic web and information extraction too.

 Please note that I am considering making this last homework take 
the place of the final exam. So, I want to remind you to do the 
homework individually (only consultation allowed is with the TA and 
the instructor).

Rao