Exercise 4.56.  Formulate compound queries that retrieve the following 
information:

a. the names of all people who are supervised by Ben Bitdiddle, together 
   with their addresses;

b. all people whose salary is less than Ben Bitdiddle's, together with 
   their salary and Ben Bitdiddle's salary;

c. all people who are supervised by someone who is not in the computer 
   division, together with the supervisor's name and job.

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(and (supervisor ?name (Bitdiddle Ben))
     (address ?name . ?x))

(and (salary (Bitdiddle Ben) ?ben)
     (salary ?x ?other)
     (lisp-value < ?other ?ben))

(and (supervisor ?person ?super)
     (job ?super . ?x)
     (not (job ?super (computer . ?y))))