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I think France,
Switzerland and Benelux are genetically mostly Celts but Latinized or Germanized, depending of regions, except Brittony which stays Celtic.
The ancient Gaul was invaded by a lot of tribes (especially Germanic ones) but the influence was more cultural than genetic because they didn't represent an important number of persons compare to the Gaulish population . So I don't consider them as pure Germans (guys, please don't think it's a negative opinion)
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