It may be true to say that: “The more strokes you receive, the worse it becomes.” To some extent, it is also true that later strokes re-ignite the pain of ones that have gone before, especially if they strike in the same place. But there is no mathematical progression from first to last; there are too many variables.
Often, the first stroke is painful because however much you anticipate the pain, it comes as a shock; the second seems perhaps not quite as bad, but after that it really begins to hurt. It is the intensity of pain caused by a thin rattan cane that makes it so difficult to bear. I cannot imagine how you could cope with twelve strokes, delivered in anger. It would seem interminable.