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<p>which originated in the early 1980s as an attempt to unify theoretical notions of syntactic and phonological structures, is based on the notion that all languages necessarily follow a small set of <a href="page.php?w=principle">principle</a>s and vary according to their selection of certain binary <a href="page.php?w=parameter">parameter</a>s. That is, all languages' phonological structures are essentially the same, but there is restricted variation that accounts for differences in surface realizations. Principles are held to be inviolable, but</p><p>
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