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Basically a Basque genetically is an Iberian from that zone of the peninsula without (or with few) other later genetic inputs.
So a "pure" nowadays Basque is similar to any non Basque Iberian peninsular in around 75-95%.
Basques are not genetically any survivor of anything.
Edit:Language is, but Basque syntax basically, because semantics is heavily influenced by IE languages.
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