Comparing these examples with their parasitic gap counterparts in (96) and (97), we see that a case of semigrammaticalness of a different sort is not subject to an abstract underlying order. It must be emphasized, once again, that most of the methodological work in modern linguistics raises serious doubts about the strong generative capacity of the theory. With this clarification, the earlier discussion of deviance may remedy and, at the same time, eliminate the levels of acceptability from fairly high (eg (99a)) to virtual gibberish (eg (98d)). Furthermore, the descriptive power of the base component is to be regarded as a general convention regarding the forms of the grammar. Let us continue to suppose that the natural general principle that will subsume this case suffices to account for problems of phonemic and morphological analysis.
see also: WikiPedia -- Chomskybot