UPSC CDS English Ordering of Sentences Part 2 Questions

SI: Systematic and ceaseless efforts are being made to tap scientifically the abundant solar energy available in the country.
S6 : Installation of solar thermal systems and devices has helped to save or generate energy to the extent of 350 kWh per annum.
P: These include cooking, water heating, water desalination, space heating, etc.
Q: A large number of applications in the area have already become commercial.
R: Efforts are also afoot to develop economically viable solar collectors for high temperature applications.
S: A simple and common mode in solar energy utilization is solar thermal conversion.
The proper sequence should be