S1: I was the secretary of the Philosophical Society of the Patna College. P: It was my first visit to the city and its impression on my mind was indelible. Q: In that capacity, I once led a trip to Kolkata. R: I felt I had landed in the midst of beautiful dream world of a fairy land. S: I saw the roads, the trams, the skyscrapers and the magnificent shops at the Chowranghee lane. S6: I have been to Kolkata many times since, but never has it been more pleasant than that first visit. Find the correct sequence of P, Q, R and S.