    Sentence 1: Also, considerable sims - are  spent~by the Postal Service. analyzing the  costs associated . with - worksharing; and  mailers/competitors © ‘incur. : considerable  expense.: litigating’ their _positions.“"on  worksharing: “before the” .Postal . Rate  Commission..’ :    Sentence 2: The: Postal Service: does: not  participate in worksharing.