other,0-1-P89-1008,ak The model appears capable of accommodating the sort of <term> reduplications </term> that have been observed to occur in <term> natural languages </term> , but it excludes many of the unnatural constructions that other formal models have permitted . <term> Conversationally relevant descriptions </term> are <term> definite descriptions </term> that are not merely tools for the identification of a <term> referent </term> , but are also crucial to the <term> discourse </term> in other respects .
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