For one thing, most of the methodological work in modern linguistics cannot be arbitrary in the extended c-command discussed in connection with (34). By combining adjunctions and certain deformations, any associated supporting element does not affect the structure of nondistinctness in the sense of distinctive feature theory. Notice, incidentally, that the earlier discussion of deviance appears to correlate rather closely with irrelevant intervening contexts in selectional rules. Presumably, the theory of syntactic features developed earlier is unspecified with respect to a corpus of utterance tokens upon which conformity has been defined by the paired utterance test. To characterize a linguistic level L, the descriptive power of the base component suffices to account for a parasitic gap construction.
see also: WikiPedia -- Chomskybot