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Gallaudet University, 800 Florida Ave, N.E., Washington, D.C. 20002. (email tbhanson@gallux.gallaudet.edu).

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Academic Part Time, Advanced Information Systems Section, Jet Propulsion Laboratory, Mail-Stop 525-3960, 4800 Oak Grove Drive, Pasadena, CA 91109. ( email murphy@systems.caltech.edu ). This work was done while on leave from Electronic Engineering, Dublin City University, Ireland.