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Abbrevs And Abbrev Expansion

   An abbreviation or "abbrev" is a string of characters that may be
expanded to a longer string.  The user can insert the abbrev string and
find it replaced automatically with the expansion of the abbrev.  This
saves typing.

   The set of abbrevs currently in effect is recorded in an "abbrev
table".  Each buffer has a local abbrev table, but normally all buffers
in the same major mode share one abbrev table.  There is also a global
abbrev table.  Normally both are used.

   An abbrev table is represented as an obarray containing a symbol for
each abbreviation.  The symbol's name is the abbreviation.  Its value is
the expansion; its function definition is the hook; its property list
cell contains the use count, the number of times the abbreviation has
been expanded.  Because these symbols are not interned in the usual
obarray, they will never appear as the result of reading a Lisp
expression; in fact, they will never be used except by the code that
handles abbrevs.  Therefore, it is safe to use them in an extremely
nonstandard way.  Note: Creating Symbols.

   For the user-level commands for abbrevs, see *Note Abbrev Mode:

* Abbrev Mode
Setting up Emacs for abbreviation.
* Tables
Abbrev TablesCreating and working with abbrev tables.
* Defining Abbrevs
Specifying abbreviations and their expansions.
* Files
Abbrev FilesSaving abbrevs in files.
* Expansion
Abbrev ExpansionControlling expansion; expansion subroutines.
* Standard Abbrev Tables
Abbrev tables used by various major modes.

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