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Venkatesan Guruswami (venkat@
cs.washington.edu), computer
science and engineering, university of
Washington, seattle, Wa 98105, usa
currently visiting the computer science
department, carnegie mellon university,
Pittsburgh, Pa.
Atri Rudra ( atri@cse.buffalo.edu),
computer science and engineering,
university at Buffalo, suny, Buffalo, ny.
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