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People often fasten their buttons up the wrong way. While through the observation they will find that each fastener on the same dress has the same size. If we change the internal concave-convex structure of these snap fasteners which will be arranged on the same dress, then we can make them become a big one and a small one and they are staggered arrangement on clothes. In the process the buckle, the big bump structure will not fill in the small concave structure, and the small one which has been pressed into a bigger one will sag from the big one. At last, people will no longer buckle their buckles in wrong way.