Design Feature:
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(1) One circle
(2) Rectangles
(3) Two quadrilaterals, one inside the other
(4) Quadrilaterals containing one or more circles, ellipses or polygons (specify the content)
(5) Quadrilaterals containing one or more letters
(6) Quadrilaterals containing other inscriptions
(7) Quadrilaterals with dark surfaces or parts of surfaces
(8) Quadrilaterals containing one or more rounded corners
(9) One letter
(10) Letter “U”
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