Design Feature:
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(1) Other mathematical symbols, %, pi, factor2
(2) Backgrounds, in words or numerals, divided into two, three or four
(3) One circle
(4) Circles containing one or more numerals
(5) Circles containing one or more letters
(6) Circles containing inscriptions arranged along the radius or diameter
(7) Circles with dark surfaces or parts of surfaces
(8) Green
(9) White
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