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#Two quadrilaterals, one inside the other #Other irregular parallelograms, trapezia and quadrilaterals, quadrilaterals containing one or more rounded corners #Quadrilaterals with dark surfaces or parts of surfaces #Quadrilaterals containing one or more letters #Letters in light-coloured characters on a dark background #Several letters #Series of letters separated from one another other than by a single space #Series of letters in different dimensions #Series of letters presenting different forms of writing #Letters presenting a special form of writing #Letters or numerals forming some other geometrical figure