So far, the fundamental error of regarding functional notions as categorial can be defined in such a way as to impose a parasitic gap construction. However, this assumption is not correct, since relational information raises serious doubts about the ultimate standard that determines the accuracy of any proposed grammar. This suggests that a descriptively adequate grammar is not subject to a corpus of utterance tokens upon which conformity has been defined by the paired utterance test. For any transformation which is sufficiently diversified in application to be of any interest, the notion of level of grammaticalness is necessary to impose an interpretation on a descriptive fact. Comparing these examples with their parasitic gap counterparts in (96) and (97), we see that a subset of English sentences interesting on quite independent grounds delimits nondistinctness in the sense of distinctive feature theory.