(1) Luminous sources, rays, shafts of light
(4) Quadrilaterals containing other inscriptions
(5) Quadrilaterals with dark surfaces or parts of surfaces
(6) One quadrilateral
(7) 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).
(8) One predominant colour
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