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(elisp)Transposition

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Transposition of Text
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   This subroutine is used by the transposition commands.

 - Function: transpose-regions start1 end1 start2 end2 &optional
          leave-markers
     This function exchanges two nonoverlapping portions of the buffer.
     Arguments START1 and END1 specify the bounds of one portion and
     arguments START2 and END2 specify the bounds of the other portion.

     Normally, `transpose-regions' relocates markers with the transposed
     text; a marker previously positioned within one of the two
     transposed portions moves along with that portion, thus remaining
     between the same two characters in their new position.  However,
     if LEAVE-MARKERS is non-`nil', `transpose-regions' does not do
     this--it leaves all markers unrelocated.