Design Feature:
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(1) Surfaces or backgrounds covered with squares or rectangles (except A 25.7.4)
(2) Semi-circles, semi-ellipses
(3) Squares
(4) Rectangles
(5) More than two quadrilaterals, inside one another
(6) Quadrilaterals containing one or more circles, ellipses or polygons (specify the content)
(7) Several spheres
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