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Which dialects helped form the emerging standard written Igbo?

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Thematic map of Africa showing the distribution of Niger-Congo language branches. Distinct colors represent language groups such as Atlantic, Mande, Gur, Kwa, Benue-Congo, and Bantu, with Bantu languages covering most of central, eastern, and southern Africa. A numbered key lists prominent languages in each area, and country borders are marked for reference. — Niger-Congo languages Map showing the branches and distribution of the Niger-Congo languages.

The standard literary form of the Igbo language was developed based on the Owerri and Umuahia dialects.1

Earlier in the 20th century, an attempt was made to create an artificial form of the language known as Union-Igbo, which was based on four different dialects; however, this effort was ultimately unsuccessful.1