Design Feature:
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(1) Squares
(2) Two quadrilaterals, one inside the other
(3) Quadrilaterals containing one or more letters
(4) Quadrilaterals with inscriptions projecting beyond one or more of the sides thereof
(5) Quadrilaterals containing other inscriptions
(6) Quadrilaterals with dark surfaces or parts of surfaces
(7) One letter
(8) Letter “Q”
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