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matematyka
parallelogram, wavy line, straight, obtuse-angled triangle, horizontal, infinity, bisector, alternate interior angles, obtuse angle, pentagon, quadrangle, hypotenuse, nonagon, decrease/drop/fall, acute angle, semicircural, acute-angled triangle, interval, full angle, polygon, curved, reflex/external, axis, sharply, parallel, alternate exterior angles, diagonal, slightly, octagon, mildly, broken line, heptagon