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Description of design:When the pencil is about to be used up,we usually discard it since it is not easy to use it any more , which is a very embarrassing and wasteful thing. This style of pencil we design adopts the tenon-and-mortise structure to connect the head and the tail of the pencil together. In this case, when a pencil is to be used up, we can connect its tail to the head of another pencil for the continuous use.