Consonant Mutation
The Senegamibian languages are well known for their consonant mutation, a phenomenon in which the initial consonant of a word change depending on its morphological and/or syntactic environment. In Fula, for example, the initial consonant of many nouns changes depending on whether it is singular or plural:
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pul-lo "Fulani person" ful-ɓe "Fulani people" guj-jo "thief" wuy-ɓe "thieves"
Read more about this topic: Senegambian Languages