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(elisp)Abbrev Mode

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Setting Up Abbrev Mode
======================

   Abbrev mode is a minor mode controlled by the value of the variable
`abbrev-mode'.

 - Variable: abbrev-mode
     A non-`nil' value of this variable turns on the automatic expansion
     of abbrevs when their abbreviations are inserted into a buffer.
     If the value is `nil', abbrevs may be defined, but they are not
     expanded automatically.

     This variable automatically becomes buffer-local when set in any
     fashion.

 - Variable: default-abbrev-mode
     This is the value of `abbrev-mode' for buffers that do not
     override it.  This is the same as `(default-value 'abbrev-mode)'.