Design Feature:
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(1) One circle
(2) Circles containing one or more triangles or lines forming an angle (specify the content)
(3) Circles containing one or more quadrilaterals (specify the content)
(4) Circles with dark surfaces or parts of surfaces
(5) Several triangles, juxtaposed, joined or intersecting
(6) Rectangles
(7) Other irregular parallelograms, trapezia and quadrilaterals
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