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  1.  
  2.  
  3.           intersect3 lista listb
  4.                This procedure intersects two lists, returning  a  list
  5.                containing  three  lists:   The  first list returned is
  6.                everything in lista that wasn't in listb.   The  second
  7.                list  contains  the  intersection of the two lists, and
  8.                the third list contains all the elements that  were  in
  9.                listb but weren't in lista.  The returned lists will be
  10.                sorted.
  11.