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For Vietnamese, Emacs uses special charsets internally.
They can be decoded from and encoded to VISCII, VSCII, TCVN-5712, VIQR
-and windows-1258. VSCII is deprecated in favour of TCVN-5712. The
+and windows-1258. VSCII is deprecated in favor of TCVN-5712. The
Current setting gives higher priority to the coding system VISCII than
TCVN-5712. If you prefer TCVN-5712, please do: (prefer-coding-system
'vietnamese-tcvn). There are two Vietnamese input methods: VIQR and