I suggested that these results would follow from the assumption that any associated supporting element is to be regarded as a corpus of utterance tokens upon which conformity has been defined by the paired utterance test. However, this assumption is not correct, since the systematic use of complex symbols may remedy and, at the same time, eliminate a stipulation to place the constructions into these various categories. In the discussion of resumptive pronouns following (81), this selectionally introduced contextual feature is necessary to impose an interpretation on an important distinction in language use. On the other hand, the descriptive power of the base component can be defined in such a way as to impose the extended c-command discussed in connection with (34). With this clarification, a subset of English sentences interesting on quite independent grounds raises serious doubts about a general convention regarding the forms of the grammar.
see also: WikiPedia -- Chomskybot