A method and system for notifying a non-published customer of a telephone network the number and possibly the identity of callers who have been attempting to obtain their non-published number from directory assistance. There is provided a patterning method for forming a group of patterns in which first patterns to serve as basic units are repetitively arranged using a plurality of exposure masks. Along these lines, the instance control function can be activated by interacting with an icon, a window, or a desktop. The first surfaces face the air gap. The present invention not only produces a tidy appearance especially applicable to metal darts, but also increases fun of the game.