Directions: In the following items, each passage consists of six sentences. The first sentence (S1) and the final sentence (S6) are given. The middle four sentences (P, Q, R, S) have been jumbled. Find the proper sequence.

S1: A great part of Arabia is desert.

S6: Such place is called an oasis.

P: The sand is so hot that you cannot walk over it with your bare feet in the day time.

Q: These springs are few and far apart, but wherever there is one, green grass very soon covers the ground all around it.

R: Here there is nothing but sand and rock.

S: Here and there in the desert are springs of water that come from deep down under the ground.