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∂AIL Dr. Masahiko Sato↓Research Institute for Mathematical Sciences
↓Kyoto University↓Kyoto Japan∞

Dear Dr. Sato:

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

	Please transmit my best regards to Professor Takasu and
Professor Igarashi.

.sgn