In a diffusion sheet, a plurality of approximately trapezoidal columnar unit lens portions are disposed such that the long-axis directions thereof are in parallel with each other, and all the surfaces of the unit lens portions, which correspond to the long bottom segments of the approximately trapezoidal sections of the unit lens portions are disposed on a light-incident-side flat surface. The remote control may include a control for selectively transferring a paintball in accordance with the paintball’s density, from the first or second plurality of paintballs, to the gun barrel and may control elevation of the gun barrel. Preparation method is a synthetic method of solid phase reaction. The at least two or more bus assemblies each have a planar bus member and one or more collar assemblies coupled to each planar bus members. A first locating member is positioned underneath the bearing surface, and a shaft is mounted to the underside of the support and extends through the bearing surface and the locating member. The cutting heads having a portion extending beyond the periphery of the plate.