Letter-on perfect, of the type comprising a single piece of paper, of rectangular shape with two transverse lines determinants folded three rectangular zones of equal size, which allow the formation of a sheet by folding of one on another, essentially characterized by the fact that two adjacent zones belonging to one face of the blank behave optionally combined graphic motifs with inscriptions, being one of said graphic zones located within the sealed cover, the other on the outside thereof, being effected closing by three tabs reduced width respectively derived from the free sides of the end and outer zone of the formed.
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