| http://www.w3.org/ns/prov#value | - Often, the results returned by a meta search engine are not as relevant as those returned by a standard search engine.MammaMamma is an unusual meta search engine in that it only searches a few major indexes the rest of the sites queried are directories or paid-placement services.Launched in 1996, Mamma was one of the Internet???s first tier 2 metasearch engines.
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