In the following question, there are six sentences marked S1, S6, P, Q, R, and S. The positions of S1 and S6 are fixed. You are required to choose one of the four alternatives which would be the most logical sequence of the sentence in the passage.

S1. In Palaeopathology

P. would be to obtain

Q. the fundamental objective

R. as much background information

S. of the skeleton as possible

S6. to study the ancient disease and injuries in organisms.