Bug#92703: document class 'letter' doesn't understand \opening

[Julian Gilbey <J.D.Gilbey@qmw.ac.uk>]

As noted, this is not a bug in the tetex system, but in your input
file; patch against the docs would be nice, otherwise this bug should
be closed.

   Julian

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         Julian Gilbey, Dept of Maths, Queen Mary, Univ. of London
       Debian GNU/Linux Developer,  see http://people.debian.org/~jdg
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