S1: Of course, it is silly to try to overcome fears that keep us from destroying ourselves. P: This is sensible. Q: You wait until it is out of the way before crossing. R: You need some fears to keep you from doing foolish things. S: You are afraid of an automobile coming rapidly down the street you wish to cross. S6: The only fears you need to avoid are silly fears which prevent you from doing what you should do. Find the correct sequence of P, Q, R and S.