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If the books are short in the bookstand, they are apt to be fallen down.
You set the length of pillar fit to the number of volumes and then put in one book regardless of its numbers.
The one book becomes a supporting stand and thus prevents falling down of other books.
The books will be put in neatly without being fallen down.
Keimyung university
Daegu, South Korea
sangyong Park, jaehong Jo, junho Seo