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 Department layout variation:
   Given  a set of departments and traffic between pairs of departments, and
   a set of candidate locations and distances between pairs of locations, and
   a cost for assigning a specific department to a specific location,
   assign departments to locations
   so as to minimize sum of 
      total distance weighted traffic cost 
     + any specific department to specific location costs & constraints;

 ITEM transfer variation:
   Given transfers between ITEMs at an airport,
   and distance between LOCNs/areas,
   assign ITEMs to LOCNs so as
   to minimize total passenger travel distance;