The following six sentences come from a paragraph. The first and the last sentences are given. Choose the order in which the four sentences (PQRS) should appear to complete the paragraph.
S1 : Materially advertisements do us no good.
S6 : They have but one requirement that their intrusion should be conspicuous.
P : The advertisements treat closely on their heels and destroy its effect. Q : Spiritually they are one of the worst avoidable evils.
R : Our buildings are covered with prints and pictures that distract and wear us.
S : Architects might give their designs dignity or the beauty of pattern.
Select the correct sequence.