Internal Variation
Even if most linguists do separate Catalan and Occitan, both languages have been treated as one in studies by Occitan linguists attempting to classify the dialects of Occitan in supradialectal groups. This is the case of Pierre Bec or, more recently, of Domergue Sumien. Both join together in an Aquitano-Pyrenean or Preiberian group Catalan, Gascon and a part of Languedocien, leaving the rest of Occitan in one (Sumien: Arverno-Mediterranean) or two groups (Bec: Arverno-Mediterranean, Central Occitan).
Read more about this topic: Occitano-Romance Languages
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