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This is a modified design capacity of about Mark pen
Products, with the most direct language to tell the user profile
Which side is the side of the square, which side is round.
To address peopleWhen using markers were erroneous problem!
Zhengzhou University of Light Industry EASTERN international art college
Zhengzhou, China
Zhikuo Deng,
Zhengzhou University of Light Industry EASTERN international art college
QingQing Zhu,
Zhengzhou University of Light Industry EASTERN international art college
XiaoMing Xu,
Zhengzhou University of Light Industry EASTERN international art college
Shucheng Wan,
Zhengzhou University of Light Industry EASTERN international art college