Guidelines
governing the use of digits or spelled-out forms should be
agreed on before typing begins and the agreed format should be
described in the key file. In many languages, all language numbers
less than 20 are spelled out in full. In one Indian language, a
special number code was used to specify both the spelled out and
numerical digit notation in order to support the publication of both
new reader and regular editions. An example of this is given in
Table
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