"Productive" means that a pattern may be applied to new items. Degrees of productivity are highly correlated with the type frequency of a pattern within a language. - Bybee (2004), a pag.66 For the following discussion, it is useful to distinguish between the terms "productive" and "default". I have been using a gradient notion of productivity coinciding with the ability of a pattern to apply to novel forms. - Bybee (2004), a pag.53
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