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This product is designed for the beginners of character a pen. This pen by detecting beginners writing stroke order and writing the direction is correct and decide whether out of ink.
When scholars write the stroke order or stroke direction error, pen in the ink will not be able to flow out; When scholars writing stroke order and stroke direction are correct, the pen in the ink to flow out. There is a range of pen testing stroke direction is correct, having written stroke direction away from the correct stroke direction is less than 20 degrees, which is for the correct stroke direction, ink can out flow; Conversely, when more than 20 degrees