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From: Drew Adams <drew.adams@oracle.com>
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Subject: RE: Emacs as a distraction free environment
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> You can use =E2=80=98rotatef=E2=80=99 to swap the values of two variables=
.
>=20
>  (rotatef mode-line-format stashed-mode-line-format))

Or as we say in Lisp...

(setq A  (prog1 B (setq B  A))) ; Swap A and B