If only one value is present in international communications, its syntax is String(OM_S_PRINTABLE_STRING). If two values are present, in either domestic or international communications, the syntax of the first is String(OM_S_PRINTABLE_STRING), the syntax of the second is String(OM_S_TELETEX_STRING), and the two convey the same information such that either can be safely ignored. For example, Teletex strings allow inclusion of the accented characters commonly used in many countries. Not all input/output devices, however, permit the entry and display of such characters. Printable strings are required internationally to ensure that such device limitations do not prevent communications.