This work has been funded variously by the Department of Defense Advanced Research Project Agency under grants MDA972-92-J-1002 and F33615-93-1-1330, by the National Science Foundation Grants CCR-9109469 and CCR-9112880, by a grant from Siemens Corporate Reseaerch, and by the Carnegie Mellon University School of Computer Science and Software Engineering Institute (which is a Federally Funded Resarch and Development Center sponsored by the US Department of Defense and operated by Carnegie Mellon University under Contract F19628-90-C-0003). The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of any of the above organizations (or any others -- how can an organization have an opinion?). The US government has a royalty-free government purpose license to use, duplicate, or disclose the work. Not only that, we encourage the rest of you to do the same -- just give us credit.
We thank Ralph Johnson of the University of Illinois at Urbana-Champaign and Bill Griswold of the University of California at San Diego for their comments.
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