Designing integrated circuitry includes simulating noise of modeled IC operation and applying the noise to buffers of a clock tree of the modeled IC, responsively generating a first simulated clock tree output signal. A cylinder head is formed by casting. The first arm is connected with a bent section. The height of the wheel and the diameter of the axle are sufficient so that glass blades on the lawn are not bent downward and extend upward between the two discs. An image generating unit generates color image data by extracting the color pixel data on each of the pixels for each of color components upon determination that the color output is to be performed, and generates monochrome image data by extracting the monochrome pixel data on each of the pixels upon determination that the monochrome output is to be performed. The instrument is then inserted into the center of the stem and thus into the trajectory path.