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 : There was a check-post for passing vehicles at a village called Gobindapur, a short distance from where the road to Dhanbad branched off from the Grand Trunk Road.
S6 : He asked me more than once if I was sure that the man had noted the number down.
P : When I came sufficiently near, he moved back and the barrier was lifted.
Q : I slowed down and found a man coming forward with pencil and book in hand.
R : I told uncle that the man had taken down the number of the car, adding that it was a routine practice.
S : As I approached it, I saw the barrier coming down slowly.
Select the correct sequence.