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 : Tom Walker and his wife were always at loggerheads.
S6 : Tom silently thanked God for this relief.
P : She never tired of reproaching him on this score.
Q : Tom was incurably lazy and talkative.
R : One day Mrs. Walker caught a deadly cold, and shortly afterwards, died.
S : This was a constant source of irritation to his wife.
The proper sequence should be: