Summarizing, then, we assume that the earlier discussion of deviance appears to correlate rather closely with the requirement that branching is not tolerated within the dominance scope of a complex symbol. On our assumptions, most of the methodological work in modern linguistics is unspecified with respect to a descriptive fact. From C1, it follows that this analysis of a formative as a pair of sets of features is rather different from a corpus of utterance tokens upon which conformity has been defined by the paired utterance test. I suggested that these results would follow from the assumption that the natural general principle that will subsume this case raises serious doubts about the ultimate standard that determines the accuracy of any proposed grammar. Clearly, an important property of these three types of EC delimits a parasitic gap construction.
see also: WikiPedia -- Chomskybot