ap/xxxxx

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Accents and, for example, umlauts 13:20 (tech_notes#258)

in a GNU Emacs buffer:

M-x (Meta-x or Alt-x) iso-accents-mode

Then for the umlaut: " followed by letter, eg. "u

see:

http://www.gnu.org/software/emacs/manual/html_node/Minor-Modes.html