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Rates of lexical replacement per annum. (a) rates of lexical replacement in the IE languages for 200 Swadesh list meanings; (b) rates of lexical replacement in the Bantu languages for n = 102 meanings; (c) rates of lexical replacement in the Austronesian languages for n = 154 meanings. The darker shaded areas of each histogram correspond to the position of the low-limit number words (one to five). The rate for one is elevated in the Bantu and Austronesian datasets.
