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: Imitation is not civilization.
S6: When a man has begun to be ashamed of his ancestors, the end has come.
P: As ass in a lion's skin never makes a lion.
Q: It is verily the sign of awful degradation in a man.
R: Cowardly imitation never makes for progress.
S: When a man has begun to hate himself, then the last blow has come.
The proper sequence should be: