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design specification：Ruler is often used in drafting and designing. When a ruler is dropped on the ground, it is very inconvenient to pick up that thin piece of plastic. The ruler I designed is one satisfying solution to the matter. On each side of the ruler there is a slope angle which makes the ruler looks like a parallelogram on the front side. On each slope angle there are some interspace that allow your finger to flip the ruler around and pick it up. It saves us a lot of trouble.