This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.
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series/series.36.s
HVF and U with an umlaut.
The letters are sorted by their international Morse code representations:
E .
T -
I ..
A .-
N -.
M --
S ...
U ..-
etc.
 
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