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 in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark accordingly on the Answer Sheet. 

S1: Illness may start with almost any sign, but some of them are much commoner than others. 
P: It is important to note these signs
Q: Often the first sign of something wrong is that the patient just does not feel fit. 
R: They may help a doctor to decide what ls wrong. 
S: He usually relies on these signs for the diagnosis of the illness.
S6: As soon as this happens he must become alert about the signs.