1@node Acknowledgements, Overview, Top, Top 2@unnumbered Acknowledgements 3 4While "a cast of thousands" may be an overstatement, it is certainly the 5case that this document represents the work of many people. First and 6foremost, thanks go to the authors of the @cite{Revised^4 Report on the 7Algorithmic Language Scheme}, from which much of this document is 8derived. Thanks also to BBN Advanced Computers Inc.@: for the use of 9parts of their @cite{Butterfly Scheme Reference}, and to Margaret 10O'Connell for translating it from BBN's text-formatting language to 11ours. 12 13Special thanks to Richard Stallman, Bob Chassell, and Brian Fox, all of 14the Free Software Foundation, for creating and maintaining the Texinfo 15formatting language in which this document is written. 16 17This report describes research done at the Artificial Intelligence 18Laboratory and the Laboratory for Computer Science, both of the 19Massachusetts Institute of Technology. Support for this research is 20provided in part by the Advanced Research Projects Agency of the 21Department of Defense and by the National Science Foundation. 22