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

␈↓ ↓H␈↓∧Telephone 415 497-4430␈↓ 	↑February 22, 1977 




␈↓ ↓H␈↓Dr. Masahiko Sato
␈↓ ↓H␈↓Research Institute for Mathematical Sciences
␈↓ ↓H␈↓Kyoto University
␈↓ ↓H␈↓Kyoto Japan

␈↓ ↓H␈↓Dear Dr. Sato:

␈↓ ↓H␈↓        Enclosed␈αis␈αa␈αversion␈αof␈αthe␈αintroduction.␈α
 If␈αit␈αdoesn't␈αmeet␈αyour␈αrequirements,␈αI'll␈α
be␈αglad
␈↓ ↓H␈↓to modify it, or else you can.

␈↓ ↓H␈↓        Please transmit my best regards to Professor Takasu and Professor Igarashi.


␈↓ ↓H␈↓Sincerely,



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