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The Yi folder is designed to overcome the drawbacks that files cannot be inserted into the original folder instantly and external force should be relied on to open the folder. Based on the original folder, a 弧形 similar to collar, is built into the folder, making files go through the folder smoothly without depending on external force or focusing on the portals. As a result, the easily designed and beautiful structure makes people comfortable when using these folders.
Chunming-Zhang Piaopiao-Hao Yajun-Liu