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Letter paper
Evelopes and writing papers are put on two sides of the same paper. On one side there writes the body.On the other side, the cover of envelope is marked with mountain-fold , from which the four coners can be folded into envelop's shape before and then adhesive sticker is used to seal.
Zhengzhou University of Light Industry
Zhengzhou, China
PeiPei Ma,
Zhengzhou University of Light Industry
