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∂CSL Mr. Juergen Reetz↓IBM Germany, Department 3147
↓Schoenaicherstrasse 220↓Boeblingen↓West Germany∞

Dear Mr. Reetz:

	Enclosed is the paper I promised you.  I could also give
a variant of a talk I gave in Haifa at a symposium organized by
IBM Israel last year, but this is more interesting to me.
I have additional ideas and would write a new version of the paper.

.sgn