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

␈↓ ↓H␈↓∧Telephone 415 497-4430␈↓ 	↑February 16, 1979 




␈↓ ↓H␈↓Professor S. Takasu
␈↓ ↓H␈↓Research Institute for Mathematical Sciences
␈↓ ↓H␈↓Kyoto University
␈↓ ↓H␈↓Kyoto, Japan

␈↓ ↓H␈↓Dear Professor Takasu:

␈↓ ↓H␈↓Enclosed␈α∂are␈α∂two␈α∂copies␈α∂of␈α∂the␈α∂paper,␈α∂one␈α∂with␈α∂running␈α∂heads␈α∂and␈α∂the␈α∂other␈α∂without.␈α⊂ If␈α∂you
␈↓ ↓H␈↓would like any typographical changes or changes of format, they can be easily accomplished.

␈↓ ↓H␈↓Best regards to you and Mrs. Takasu.


␈↓ ↓H␈↓Sincerely,



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