    Sentence 1s" Part. of thé reas0n for ‘thie. difference. in  ‘pieces per possible delivery may.be due to'the fact that:  fivé~ percent dF: possible ‘residential’ “deliveries aie’  ‘Bysinesses, and: it: is: thought: but rot :kriown; “that a  fesser peréentage of possible deliveries.on turtl routes  are,businesses,         ‘Sentefice' 2 Reason ford lessér pecentage of passibie®  deliveries, on. rUral tutes: might, become more. clear:in  the fature.    