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Published online by Cambridge University Press: 17 February 2009
[4] For discussion of the unidirectionality of grammaticization, see Givon, 1979Google Scholar, Traugott, 1982Google Scholar, Heine, & Reh, 1984.Google Scholar
[5] These irregularities are attested in Papago material collected as early as 1910 (Mason 1950), so it would appear that the children have not ‘zeroed’ them out in two generations as Givon predicts.