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   "Completion" is a feature that fills in the rest of a name starting
from an abbreviation for it.  Completion works by comparing the user's
input against a list of valid names and determining how much of the
name is determined uniquely by what the user has typed.

   For example, when you type `C-x b' (`switch-to-buffer') and then
type the first few letters of the name of the buffer to which you wish
to switch, and then type TAB (`minibuffer-complete'), Emacs extends the
name as far as it can.  Standard Emacs commands offer completion for
names of symbols, files, buffers, and processes; with the functions in
this section, you can implement completion for other kinds of names.

   The `try-completion' function is the basic primitive for completion:
it returns the longest determined completion of a given initial string,
with a given set of strings to match against.

   The function `completing-read' provides a higher-level interface for
completion.  A call to `completing-read' specifies how to determine the
list of valid names.  The function then activates the minibuffer with a
local keymap that binds a few keys to commands useful for completion.
Other functions provide convenient simple interfaces for reading
certain kinds of names with completion.

* Basic Completion
Low-level functions for completing strings. (These are too low level to use the minibuffer.)
* Programmed Completion
Finding the completions for a given file name.
* Minibuffer Completion
Invoking the minibuffer with completion.
* Completion Commands
Minibuffer commands that do completion.
* High-Level Completion
Convenient special cases of completion (reading buffer name, file name, etc.)
* Reading File Names
Using completion to read file names.
* Lisp Symbol Completion
Completing the name of a symbol.

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