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Function: coding-system-get coding-system property

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(coding-system-get 'iso-latin-1 'mime-charset)
     ⇒ iso-8859-1
(coding-system-get 'iso-2022-cn 'mime-charset)
     ⇒ iso-2022-cn
(coding-system-get 'cyrillic-koi8 'mime-charset)
     ⇒ koi8-r

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