question: Find the first names and offices of all instructors who have taught some course and also find the course description.
#1 return instructors 
#2 return courses of #1 
#3 return number of  #2 for each #1 
#4 return #1 where #3 is at least one 
#5 return first names of #4 
#6 return offices of #4 
#7 return courses of #4 
#8 return course descriptions of #7 
#9 return #5 ,  #6 ,   #8