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Letter paper and envelop are required in compiling a letter. After an envelop is torn open, it is usually thrown away wasting half of materials. When people finish the letter on this envelop-paper, it can be folded into a complete envelop along the designed broken line at the other side. This design is for saving purpose and integrate an envelop and letter paper into a paper on front and back sides in order to save half of resources and give both functions of envelop and letter paper.
China academy of art
Junjie Zhang Wenhan Bian Yizi Chen You Chen