Ib (cuneiform) letters is usually so compact, that hardly any of the individual strokes can be easily identified. Another sign is similar in this group to cuneiform "ur", but the center is replaced by 2 stokes, one angled down, and the other a wedge (at extreme right vertical), and is the "gáb" sign. In the Amarna letters it is often used for English "all", or "all (of us)", Akkadian language, "gabbu". (Amarna letters EA 153, EA 287, EA 288, and EA 267) Ib (cuneiform) The cuneiform sign ib, (or ip) is a common-use sign in the "Epic of Gilgamesh", the Amarna letters,
Elamite cuneiform to that of the Rosetta Stone's, were written in three different writing systems. The first was Old Persian, which was deciphered in 1802 by Georg Friedrich Grotefend. The second, Babylonian cuneiform, was deciphered shortly after the Old Persian text. Because Elamite is unlike its neighboring Semitic languages, the script's decipherment was delayed until the 1840s. Even today, lack of sources and comparative materials hinder further research of Elamite. Elamite radically reduced the number of cuneiform glyphs. From the entire history of the script, only 206 glyphs are used; at any one time, the number was fairly constant at about 130.