Restrictions against the co-occurrence of certain, usually similar, consonants in verbal roots can be found in all Afroasiatic branches, though they are only weakly attested in Chadic and Omotic.
ɹᵻstɹˈɪkʃənz ɐɡˈɛnst ðə kˈoʊəkˈɜːɹəns ʌv sˈɜːʔn̩, jˈuːʒuːəli sˈɪmɪlɚ, kˈɑːnsənənts ɪn vˈɜːbəl ɹˈuːts kæn biː fˈaʊnd ɪn ˈɔːl ˌæfɹoʊˌeɪsɪˈæɾɪk bɹˈæntʃᵻz, ðˌoʊ ðeɪ ɑːɹ ˈoʊnli wˈiːkli ɐtˈɛstᵻd ɪn tʃˈædɪk ænd ɑːmˈɑːɾɪk.