The first and sixth sentences of a passage are given. The middle four sentences have been removed and jumbled up, labeled P, Q, R and S. Find the proper order for the four sentences. S1: I had halted on the road. P: As soon as I saw the elephant I knew I should not shoot him. Q: It is a serious matter to shoot a working elephant. R: I knew that his 'must' was already passing off. S: The elephant was standing 8 yards from the road. S6: I decided to watch him for a while and then go home. The proper sequence should be: