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\address 
Dr. Rolf Herken
Institut f\"ur theoretische Physik WE4A
Freie Universit\"at Berlin
Arnimallee 14
D-1000 Berlin 33
West Germany
\body
Dear Dr. Herken:

	This is to decline with thanks your invitation to take part
in the Turing volume.  The proposed framework is too narrow for
my own interests, and even if I wrote about what I am now thinking
about, it would be in a volume dominated by the concept of
computability.

\closing
Sincerely,    

John McCarthy    
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JMC/ra 
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%Enclosure
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%cc: Matthew Kahn
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%P.S.: whatever you wish to say here

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