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A traditional marker pen is an individual which is numerous and complex put all of common colors' marker pens together. When you use it what is inconvenient and not easy to take. But combination of marker pens slove this problem ingenious, to add a bump struture of which get the same color marker pen together, people would clearly to find and easy to bring with it.
Shuo LI ,
Shankai Tu ,
Jiajun ZHOU ,