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Complexity of morpheme acquisition

The words of language contain a nontrivial amount of linguistic information, such as what the word means, how it may be used in a sentence, and how it is to be spoken and written. In this article, we consider the computational problem of learning the linguistic structure of a novel word, as well as that of learning the \overall" morpho-phonology of a language. Our main result is that the computational problem of acquiring the morpho-phonology of a language is NP-complete.