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In page Tuareg languages:

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The Tuareg varieties, on account of their low internal diversity and high mutual intercomprehensibility, are commonly regarded as a single language by linguists (as for instance by Karl-Gottfried Prasse). They are distinguished mainly by a few sound shifts (notably affecting the pronunciation of original z and h). The Tuareg varieties are unusually conservative in some respects; they retain two short vowels where Northern Berber languages have one or none, and have a much lower proportion of Arabic loanwords than most Berber languages.[citation needed]