| 摘要 |
A rigid calculator cover with one or more aperture(s) corresponding to geometric contours. The geometric contours may include a straight line; a geometric shape, e.g. a circle, square, rectangle, triangle, pentagon, hexagon, octagon, ellipse, arc, and the like; a protractor-replicated aperture; alphanumeric characters; figures; and other any other shape relevant to higher education, particularly math.
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