(1) Nails, screws, bolts, rivets, dowel pins, screw nuts, drawing pins -- Note: See also 9.5.1.
(3) Circles or ellipses containing other figurative elements
(4) Two circles, two ellipses, one inside the other
(5) Triangles containing one or more circles, ellipses or polygons (except 26.3.11)
(6) Triangular figures with one or more convex or concave sides
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