Design Feature:
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(1) Greek cross, St. Andrew's cross
(2) Mathematical signs combined with figures or letters
(3) Elongated surfaces with two short sides convex or concave
(4) One circle
(5) Circles containing one or more quadrilaterals (specify the content)
(6) Circles containing one or more letters
(7) Rhombs or squares standing on one of the corners thereof
(8) Quadrilaterals with dark surfaces or parts of surfaces
(9) One letter
(10) Letter “M”
(11) INSCRIPTIONS IN CHINESE OR JAPANESE CHARACTERS
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