DC21 Letto exclusive since' 1985

#Punctuation marks, brackets, quotation marks #Surfaces or backgrounds covered with lines or bands #More than two quadrilaterals, inside one another #Quadrilaterals with dark surfaces or parts of surfaces #Quadrilaterals containing one or more letters #Quadrilaterals containing one or more numerals #Numerals in light-coloured characters on a dark background #Numerals juxtaposed or joined to a letter or a figurative element #Numerals presenting a special form of writing #Letters in light-coloured characters on a dark background #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 #Black #White, grey, silver #Red, pink, orange