The recent rapid development of transformational grammars has incorpo- rated some strong claims in the areas of semantics and co-occurrence. The earlier structuralists relied on a minimum of information about the meaning of strings of a language. They asked only if strings of sounds were different in meaning - or simply were different words or phrases. Current transfor- mational grammars, on the other hand, set as their goal the production of exactly the meaningful strings of a language. Stated slightly differently, they wish to specify exactly which strings of a language can occur together...