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2 (.*\.)?cs\.bell-labs\.com astro
3 (.*\.)?plan9\.bell-labs\.com astro
4 (.*\.)?x\.bell-labs\.com astro
5 (.*\.)?delos\.com bsdi.com
6 (.*\.)?(bostic|sleepycat)\.com bostic
18 .*\.usyd.edu.au acsnet
20 .*\.utoronto.ca toronto.edu