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It is not easy to find key points in a notebook and through printing problem is also common after writing. It is also annoying that writers do not know how many pages are left before it is used up.
National Chiao Tung Uni, National Taipei University of Technology, Ming Chi University of Technology
National Taipei University of Technology | Ming Chi University of Technology
National Taipei University of Technology Ho Yu-Ting ; Min-Chi Uneversty Of Technology Liu Rong-chen