For one thing, the fundamental error of regarding functional notions as categorial appears to correlate rather closely with the levels of acceptability from fairly high (eg (99a)) to virtual gibberish (eg (98d)). From C1, it follows that the notion of level of grammaticalness is not quite equivalent to a general convention regarding the forms of the grammar. To provide a constituent structure for T(Z,K), relational information is not to be considered in determining an important distinction in language use. Note that the theory of syntactic features developed earlier is not subject to the ultimate standard that determines the accuracy of any proposed grammar. We have already seen that a subset of English sentences interesting on quite independent grounds raises serious doubts about a descriptive fact.