||Wednesday, March 11, 2009
(1) Quadrilaterals containing one or more letters
(2) Quadrilaterals with dark surfaces or parts of surfaces
(3) Other irregular parallelograms, trapezia and quadrilaterals, quadrilaterals containing one or more rounded corners
(4) Quadrilateral figures with one or more convex or concave sides -- Note: Not including elongated surfaces with one or more convex or concave sides (25.3.1).
(5) More than two quadrilaterals, inside one another
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