To characterize a linguistic level L, the theory of syntactic features developed earlier is not quite equivalent to the extended c-command discussed in connection with (34). It must be emphasized, once again, that this analysis of a formative as a pair of sets of features does not readily tolerate a general convention regarding the forms of the grammar. However, this assumption is not correct, since the speaker-hearer's linguistic intuition can be defined in such a way as to impose a stipulation to place the constructions into these various categories. It appears that the earlier discussion of deviance is not to be considered in determining a corpus of utterance tokens upon which conformity has been defined by the paired utterance test. We have already seen that a case of semigrammaticalness of a different sort is rather different from the traditional practice of grammarians.
see also: WikiPedia -- Chomskybot