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Whenever we want to tear a sheet off the notepad after writing it, we tend to tear more than one at a time. Since the traditional notepad is like a cube, it is that the fingers may contact several pages when flipping it that accounts for this kind of problem. Now the contact surface of the notepad is beveled in 30 degrees, much smaller than it used to be, which can solve this kind of problem.
Keyi college of zhejiang Sci-Tech
Hangzhou, Zhejiang Province, China
Bin Li Bin Yu Pengfei Shi Nan LI