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Universals/Chomsky/Millikan: that even applies if Chomsky is right and there are universals. These merely guarantee that there are certain properties that are not copied.
Reproduction: all that is necessary for them is that there are some variables, so that the reproduction follows their model, with regard to these variables.
For each word token and for each syntactic form token, there is one of myriads of causal explanations that shows why it is a reproduction.
R. G. Millikan
Language, Thought, and Other Biological Categories: New Foundations for Realism Cambridge 1987