A method of representing a development project is presented comprising identifying a plurality of sources comprising the development project, determining whether any of the sources are required simultaneously and, if not, dynamically generating a filter graph representation of the development project utilizing a segment filter to couple a source to multiple processing threads. It comprises a cuff that is connected to the sphygmomanometer main body by a tube, a display unit for displaying the results of blood pressure measurements, and an air supply unit for supplying air to, and thus pressurizing, the cuff, which is detachable from the sphygmomanometer main body. The tractor unit has first coupling means provided on a fifth wheel which engages with second coupling means typically in the form of a kingpin on the trailer unit. For each scanline of the image, pixel difference values between each adjacent pixels of at least one run of pixels of the scanline is determined. Unlike other sorting techniques, optical fractionation can operate continuously and can be continuously optimized. The first and second wiring layers are positioned superposing each other in a plan view.