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ntua.announce
ntua.autos
ntua.comp
ntua.comp.games
ntua.comp.linux
ntua.comp.programming
ntua.comp.security
ntua.comp.windows
ntua.dialup
ntua.discuss
ntua.flames
ntua.internet
ntua.music
ntua.philosophy
ntua.sports
ntua.telecom
ntua.travel
ntua.tv-cinema