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Matlatzinca, or more specifically San Francisco Matlatzinca, is an endangered Oto-Manguean language of Central Mexico. The name of the language in the language itself is pjiekak'joo. In 2020 Matlatzinca was spoken by around 1,200 persons. At any one time, about half the population is in the village of San Francisco Oxtotilpan and half away in Mexico City.