2.1.981 Part 1 Section 18.17.7.191, LEFT

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a.   The standard states that LEFT is intended for use with languages that use the single-byte character set (SBCS), whereas LEFTB is intended for use with languages that use the double-byte character set (DBCS).

In Office, LEFT is intended for use with any language, whereas LEFTB is intended for use with languages that use the double-byte character set (DBCS).