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In page Languages of Africa:
"Nilo-Saharan languages are a proposed grouping of some one hundred diverse languages. Genealogical linkage between these languages has failed to be conclusively demonstrated, and support for the proposal is sparse among linguists.[1][2] The languages share some unusual morphology, but if they are related, most of the branches must have undergone major restructuring since diverging from their common ancestor.[citation needed]
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