This may be more of a math problem; it arose out of my curiosity of manipulating LED matrices and reminds me of a traffic flow problem, but im sure it can model a variety of applications. Its not a homework problem but would probably make a good one! You have a 3x3 grid of points, each point must be provided with an equal amount of flow from one of the outer points. I thought you could "split" the lines from the outer point for 2, 4, 8 (flow in = flow out and the flow is being halved each time), but this only seems to work for a 2x4 configuration, since otherwise the paths to the source would be different and hence flow rate would be effected. Is this possible? Any advice? Thanks in advance any help is greatly appreciated.