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Transposing Text

     Transpose two characters (`transpose-chars').

     Transpose two words (`transpose-words').

     Transpose two balanced expressions (`transpose-sexps').

`C-x C-t'
     Transpose two lines (`transpose-lines').

   The common error of transposing two characters can be fixed, when
they are adjacent, with the `C-t' command (`transpose-chars').
Normally, `C-t' transposes the two characters on either side of point.
When given at the end of a line, rather than transposing the last
character of the line with the newline, which would be useless, `C-t'
transposes the last two characters on the line.  So, if you catch your
transposition error right away, you can fix it with just a `C-t'.  If
you don't catch it so fast, you must move the cursor back to between
the two transposed characters.  If you transposed a space with the last
character of the word before it, the word motion commands are a good
way of getting there.  Otherwise, a reverse search (`C-r') is often the
best way.  Note: Search.

   `M-t' (`transpose-words') transposes the word before point with the
word after point.  It moves point forward over a word, dragging the
word preceding or containing point forward as well.  The punctuation
characters between the words do not move.  For example, `FOO, BAR'
transposes into `BAR, FOO' rather than `BAR FOO,'.

   `C-M-t' (`transpose-sexps') is a similar command for transposing two
expressions (Note: Lists.), and `C-x C-t' (`transpose-lines')
exchanges lines.  They work like `M-t' except in determining the
division of the text into syntactic units.

   A numeric argument to a transpose command serves as a repeat count:
it tells the transpose command to move the character (word, sexp, line)
before or containing point across several other characters (words,
sexps, lines).  For example, `C-u 3 C-t' moves the character before
point forward across three other characters.  It would change
`f-!-oobar' into `oobf-!-ar'.  This is equivalent to repeating `C-t'
three times.  `C-u - 4 M-t' moves the word before point backward across
four words.  `C-u - C-M-t' would cancel the effect of plain `C-M-t'.

   A numeric argument of zero is assigned a special meaning (because
otherwise a command with a repeat count of zero would do nothing): to
transpose the character (word, sexp, line) ending after point with the
one ending after the mark.

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