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All Double Combinations (Superimposed) of Geometric Figures (Circle, Square, Triangle, Rectangle, Trapezoid, Parallelogram): One Plate (Krakow/Witkin 1977.08 Awaiting results Lot #111 etching with ...
IMO 1959 P5: regular polygon (for square as case thereof) IMO 1959 P6: geometrical construction (in 3D), (isosceles trapezium / trapezoid), quadrilateral with circle inscribed IMO 1960 P4: geometrical ...
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