So, now since the ship is a closed body I can represent the ship by a number of sources and sinks, and what is it, what is the strength of the source? The strength of the source is the slope of the water line that means, I have large strength sources in the forward end and large strength sources in the aft end, and in the middle I may have sources and sinks with lesser strength. The source and sink distribution should be such that it represents the body. Now, the mathematical formulation is primarily this, but this gives us very interesting observations, the reason I am telling you this is that we get some very interesting observations. What we get is, that the strength of the source is proportional to the water line slope, slope of the water line- we have discussed this before, slope of the water line, the discontinuity at the beginning, there is large source strength there because the slope is the highest. So, if you say that the forward wave crest is a phenomenon of the strength of the source of the forward end and we want to reduce wave making resistance, one of the ways to do it is to reduce the source strength of the forward end or reduce the slope at the forward end, am I clear?