Question: Where was the language based on the Boko alphabet primarily used?
Sentence (from "Hausa language"): Hausa ( ) ("Yaren Hausa" or "Harshen Hausa") is the Chadic language (a branch of the Afroasiatic language family) with the largest number of speakers, spoken as a first language by more than 70 million people, and as a second language by another 40 to 50 million or more.
Relevant evidence: Yes