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For example, if an ISO 3166-1 region code is deprecated
in favor of another code, that SHOULD result in the addition of a
'Preferred-Value' field
from the top result below
https://datatracker.ietf.org/doc/html/rfc5646
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RFC 5646
Best Current Practice
Title Tags for Identifying Languages
Document Document type RFC - Best Current Practice
September 2009
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Obsoletes RFC 4646
Was draft-ietf-ltru-4646bis (ltru WG