A method of forming fine patterns of a semiconductor device according to a double patterning process that uses acid diffusion is provided. The illumination device includes: a light guide having an end face for taking in light, a diffuse reflecting surface for diffusely reflecting the light taken in from the end face, and a light exit surface for emitting the light that is diffusely reflected at the diffuse reflecting surface towards an irradiation surface. When the player does so, the game assigns an award set to each pick button of the display. This invention is generally applicable to any II\u2013VI or III\u2013V semiconductor material, and may be useful in generating metal-nonmetal compounds involving transition metals as well. Lower peripheral wall portions, of a cylinder wall continue with left and right both sides, of a lower side portion of an inter-cylinder wall in a front and rear direction and increase their thicknesses progressively as they approach the left and right both sides,. A tensioning device is interposed between the braiding tool and shipping or storage spool whereby the individual variable length axial yarns are subjected to constant tensioning.