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We used to be confront with such problems as being pricked by drawing pins by accident when we collect and use them.Even if they are in a box,being pricked by them is still ineluctable. However,‘Superposition thumbtack ’ solves this problem. The drawing pinsare shaped as pens. We can just hold the ‘Pen’when we are working. Thus we can avoid being, pricked by them and also could pick them joint by joint. Not only it is convenient to collect, but also avoid being hurt.