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In a composite font the file carries (FMapType 2 or a CMap), cshow ran its procedure once for each byte of the string, with that byte's width in the composite font and the composite font still current. It now runs once for each character the font maps, with the last byte of its code and its width, and with the descendant that draws it current, at the size the composite font sets it, while rootfont gives the composite font (PLRM 3rd ed., cshow and rootfont). While the procedure runs, showing the byte it was given in that descendant shows the character the code maps to: a CMap's CID, base-font code or glyph name. In a CIDFont any other string is a rangecheck error.