Nilo-Saharan languages
Bender's reconstruction

The consonant system reconstructed by Bender for Proto-Nilo-Saharan is:

The phonemes /*d₂, *t₂/ correspond to coronal plosives, the phonetic details are difficult to specify, but clearly, they remain distinct from /*d, *t/ and supported by many phonetic correspondences (another author, C. Ehret, reconstructs for the coronal area the sound, and, which perhaps are closer to the phonetic detail of /*d₂, *t₂/, see infra)

Bender gave a list of about 350 cognates and discussed in depth the grouping and the phonological system proposed by Ch. Ehret. Blench (2000) compares both systems (Bender's and Ehret's) and prefers the former because it is more secure and is based in more reliable data. For example, Bender points out that there is a set of phonemes including implosives /*ɓ, *ɗ, *ʄ, *ɠ/, ejectives /*pʼ, *tʼ, (*sʼ), *cʼ, *kʼ/ and prenasal constants /*ᵐb, *ⁿd, (*ⁿt), *ⁿɟ, *ᵑg/, but it seems that they can be reconstructed only for core groups (E, I, J, L) and the collateral group (C, D, F, G, H), but not for Proto-Nilo-Saharan.
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