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␈↓ ↓H␈↓␈↓βS␈↓∧ Artificial Intelligence Laboratory, STANFORD UNIVERSITY, Stanford, California 94305

␈↓ ↓H␈↓∧Telephone 415 497-4430␈↓ 
⊃April 18, 1977 




␈↓ ↓H␈↓Professor Michael Hammer
␈↓ ↓H␈↓Laboratory for Computer Science
␈↓ ↓H␈↓545 Technology Square
␈↓ ↓H␈↓Cambridge, Massachusetts 02139

␈↓ ↓H␈↓Dear Professor Hammer:

␈↓ ↓H␈↓Enclosed␈α
is␈αa␈α
draft.␈α
 If␈αyou␈α
don't␈αreject␈α
it␈α
out␈αof␈α
hand,␈αI␈α
will␈α
revise␈αit.␈α
 Perhaps␈α
in␈αcollaboration
␈↓ ↓H␈↓with Marvin Minsky.


␈↓ ↓H␈↓Sincerely,



␈↓ ↓H␈↓John McCarthy
␈↓ ↓H␈↓Director
␈↓ ↓H␈↓Professor of Computer Science