Look On My Words, Ye Mighty, And Despair!

        Thus the notion of level of grammaticalness does not readily tolerate the system of base rules exclusive of the lexicon. Of course, most of the methodological work in modern linguistics can be defined in such a way as to impose the ultimate standard that determines the accuracy of any proposed grammar. It must be emphasized, once again, that a case of semigrammaticalness of a different sort is not to be considered in determining the requirement that branching is not tolerated within the dominance scope of a complex symbol. To provide a constituent structure for T(Z,K), the theory of syntactic features developed earlier is necessary to impose an interpretation on nondistinctness in the sense of distinctive feature theory. On our assumptions, a descriptively adequate grammar is not subject to irrelevant intervening contexts in selectional rules.

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see also: WikiPedia -- Chomskybot