Direction: In the following question, the first and the last part of the passage is numbered as 1 and 6. The rest of the passage is split into six parts and numbered as P, Q, R, and S. These four parts are not given in the proper order. Read the sentences and find out which of the four combinations is correct.

S1 It is hard to think of a world without books.
P But hardly a hundred years ago, there were no books.
Q They had to be written by hand.
R And it took several years to make one.
S They cost a lot of money.
S6 Later on Painting was invented.