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 == Contents ==

Acknowledgements
Thanks are due to Gerald Sussman, Carl Hewitt, Allen Brown, Jon Doyle, Richard Stallman, and Richard Zippel for discussing the issues presented here and for proofreading various drafts of the document.

An earlier version of this document was submitted in April 1976 to the Department of Electrical Engineering and Computer Science at MIT in the form of a proposal for research towards a Master's Thesis.