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Note: ISO 639-2 is the alpha-3 code. Where two codes
are provided (21 languages total), the bibliographic code is given first
and the terminology code is given second. ISO 639-1 is the alpha-2 code.
Multiple codes for the same language are to be considered synonyms.
- Deprecated codes are listed inside brackets 
with a hyphen preceding the code.
- Categories of change key: Add = Newly added; Dep = Deprecated; CC = Code change; NC = Name change; NA = Variant name(s) added.
|ISO 639-2 code
||ISO 639-1 code
||Deprecated ISO 639-2
||Deprecated ISO 639-1
||fy|| || ||2005-11-16||NC||Previous usage of code has been for Western Frisian, although language name was "Frisian"|
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