    Sentence « That is, as the discount is increased  in steps, the cost to the Postal Service of  sorting the mail that becomes workshared  on step 4 is probably —_ greater  than the cost of sorting the mail that becomes  workshared on step 3. This assumption  will be relaxed in” Part Ill below,  where larger discount changes are considered.    Sentence 2: This assumption will be relaxed in  Part Ill below.