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   A "position" is the index of a character in the text of buffer.
More precisely, a position identifies the place between two characters
(or before the first character, or after the last character), so we can
speak of the character before or after a given position.  However, the
character after a position is often said to be "at" that position.

   Positions are usually represented as integers starting from 1, but
can also be represented as "markers"--special objects which relocate
automatically when text is inserted or deleted so they stay with the
surrounding characters.  Note: Markers.

* Point
The special position where editing takes place.
* Motion
Changing point.
* Excursions
Temporary motion and buffer changes.
* Narrowing
Restricting editing to a portion of the buffer.

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