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In page Central Atlas Tamazight:

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Tamazight is in the middle of a dialect continuum between Riff to its north-east and Shilha to its south-west.[5] The basic lexicon of Tamazight differs markedly from Shilha, and its verbal system is more similar to Riff or Kabyle.[5] Moreover, Tamazight has a greater amount of internal diversity than Shilha.[7]