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We often forget which one is our cup when there are many people in the occasion.
The design of the paper cup can solve the problem by a easy way!
Divide the underneath of cup side into 8 parts, and mark one to eight on the parts. When you want to distinguish your cup, you can fold any number to achieve your goal.
Lin,Kuan-You Luo,Song-Yang Chan,Bing-Han Wang,Zhi-Hong
New Taipe, Taiwan