problems of phonemic and morphological analysis.
a corpus of utterance tokens upon which conformity has been defined by the paired utterance test.
the traditional practice of grammarians.
the levels of acceptability from fairly high (eg (99a)) to virtual gibberish (eg (98d)).
a stipulation to place the constructions into these various categories.
a descriptive fact.
a parasitic gap construction.
the extended c-command discussed in connection with (34).
the ultimate standard that determines the accuracy of any proposed grammar.
the system of base rules exclusive of the lexicon.
irrelevant intervening contexts in selectional rules.
nondistinctness in the sense of distinctive feature theory.
a general convention regarding the forms of the grammar.
an abstract underlying order.
an important distinction in language use.
the requirement that branching is not tolerated within the dominance scope of a complex symbol.
the strong generative capacity of the theory.
Quine's demonstration of the impossibility of translation between natural languages.
the speaker's subconscious awareness of structural semantic fields. 
a complete analysis of the meaning of natural language utterances in logical terms.
the inheritance hierachy in Figure 8.3, where 'blue whales' are both aquatic and mammalian.
an inheritance hierarchy described as a direct acylic graph (Levesque and Selman 1989).
the common sense knowledge needed to accomplish this task.
the frame representation found in Charniak (1976b) (Almost none of the program described here has been implemented).
the notion of a script (Schank 1977).