I think S.O.S means waiting: waiting for somebody to save our life; waiting for somebody to save our soul. Maybe S.O.S is waiting itself. But maybe S.O.S is also a belief: belief that somebody will come to save our soul and life. We wait becasue we have belief. Maybe Christianity became so powerful religion becasue the idea of the coming of the City of God created a condition in which people HAD to have a strong belief in the religion. The more distant the coming of the City of God, the stronger the belief in its coming? Hmm. I did not want to get into the discussion in religion. I just happened to think of it as an exam. Maybe a mistaken exam. S.O.S, what is it?