Presumably, the speaker-hearer's linguistic intuition appears to correlate rather closely with a general convention regarding the forms of the grammar. It must be emphasized, once again, that this analysis of a formative as a pair of sets of features delimits nondistinctness in the sense of distinctive feature theory. For one thing, the descriptive power of the base component is unspecified with respect to a parasitic gap construction. However, this assumption is not correct, since the theory of syntactic features developed earlier cannot be arbitrary in problems of phonemic and morphological analysis. From C1, it follows that the natural general principle that will subsume this case is, apparently, determined by the extended c-command discussed in connection with (34).
see also: WikiPedia -- Chomskybot