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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 adjacent characters can be fixed
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, `C-t' transposes the last two characters on the line, rather than
transposing the last character of the line with the newline, which
would be useless.  If you catch a transposition error right away, you
can fix it with just `C-t'.  If you catch the error later,  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.

   `Meta-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.  It works like `M-t' but in determines the division of
the text into syntactic units differently.

   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.  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 transposes the character (word, sexp,
line) ending after point with the one ending after the mark (otherwise a
command with a repeat count of zero would do nothing).

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