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(emacs)RegRect

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Saving Rectangles in Registers
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   A register can contain a rectangle instead of linear text.  The
rectangle is represented as a list of strings.  Note: Rectangles, for
basic information on how to specify a rectangle in the buffer.

`C-x r r R'
     Copy the region-rectangle into register R
     (`copy-rectangle-to-register').  With numeric argument, delete it
     as well.

`C-x r i R'
     Insert the rectangle stored in register R (if it contains a
     rectangle) (`insert-register').

   The `C-x r i R' command inserts a text string if the register
contains one, and inserts a rectangle if the register contains one.

   See also the command `sort-columns', which you can think of as
sorting a rectangle.  Note: Sorting.