How to mark a rectangle

[Pawel]

Maybe this is not a shortest solution, but I'm doing it this way:
M-x kill-rectangle
M-x revert-buffer

billy writes:
 > I have searched this news groups and searched the manual pages.  I can
 > find nothing, probebly overlooking, as to how to mark a rectangle.  I
 > find plenty of stuff to deal with it, but not how to get it.
 > 
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