Design Feature:
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(1) Lines or bands forming an angle
(2) One ellipse
(3) Ellipses containing one or more triangles or lines forming an angle (precise the content)
(4) Ellipses containing one or more letters
(5) Ellipses with dark surfaces or parts of surfaces
(6) Letters or numerals forming some other geometrical figure
(7) One letter
(8) Letter “S”
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