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\address
Mr. Edmund H. Immergut
Managing Editor
Encyclopedia of Applied Physics
2 Sidney Place
Brooklyn, NY  11201
\body

Dear Mr. Immergut;

Thank you for asking me to contribute an article on Cybernetics to
the Encyclopedia of Applied Physics.

I must decline your invitation as this is a field in which my knowledge 
is limited.

\closing
Sincerely,
John McCarthy
\endletter
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