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∂AIL Professor S. Takasu↓Research Institute for Mathematical Sciences
↓Kyoto University↓Kyoto, Japan∞

Dear Professor Takasu:

Enclosed are two additional copies of the paper, one with running heads and the other
without.  The only change is that the author's addresses and some additional
grant information was added to the first page.

Also, could you please send me the correct publication information so that I may
reference the paper.

Best regards to you and Mrs. Takasu.

.sgn