Searching a specific set of domains

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Anyone know if it's possible to search within a specific set of domains?
I know that I can search within a specific domain, by using the "site:"
web search feature in Google; but can I set it to search more than one
For instance, have one search field, which will search for results from
either <> or < ?

Furthermore, would it be possible to include a certain newsgroup in that
search, like < ?

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