Design Feature:
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(1) Seals or stamps, circular
(2) Two polygons, one inside the other (except 26.5.10 and 26.5.11)
(3) Polygons containing other inscriptions
(4) Polygons with dark surfaces or parts of surfaces
(5) Two lines or bands
(6) Curved lines or bands (except A 26.11.13)
(7) Letters or numerals in perspective (decreasing towards the center, towards one extremity or towards both extremities - rectilinear)
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