There are 10 equally spaced points around the circle. at 9 points, there are sheep, and at one point, there is a wolf. at each time step, the wolf moves clockwise with probability p or counterclockwise with probability 1-p by 1 point. if there is a sheep at that point, the wolf eats it. the sheep don't move. what is the probability that the sheep who is initially behind the wolf is the last one remaining?