The following six sentences come from a paragraph. The first and the last sentences are given. Choose the order in which the four sentences (PQRS) should appear to complete the paragraph.
S1 : Illness may start with almost any sign, but some of them are much commoner than others.
S6 : As soon as this happens he must become alert about the signs.
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 is wrong.
S : He usually relies on these signs for the diagnosis of the illness.
The proper sequence should be: