Akan, or Twi-Fante, is the principal native language of Ghana, spoken over much of the southern half of that country, by about 40% of the population, and to a lesser extent across the border in eastern Côte d'Ivoire. Three dialects have been developed as literary standards with distinct orthographies, Asante, Akuapem (together called Twi), and Fante, which despite being mutually intelligible were inaccessible in written form to speakers of the other standards. In 1978 the Akan Orthography Committee established a common orthography for all of Akan, which is used as the medium of instruction in primary school by speakers of several other Akan languages such as Anyi, Sefwi, Ahanta (but not Nzema), as well as the Guang languages.