“…Artificial materials can be constructed with various degrees of conformity with presumed grammatical and semantic rules of the language. There is generally a high degree of agreement as to how "grammatical" a sentence is (Coleman, 1965b;Danks, 19698., 1969b;Danks and Lewis, 1970;Downey and Hakes, 1968;Stolz, 1969;Tikofsky, Reiff, Tikofsky, Oakes, Glazer, and Mclnish, 1967), but under certain circumstances this is not necessarily the case (Maclay and Sleator, 1960;Quirk and Svartvik, 1966 (1965a, 1965b), Epstein (1961Epstein ( , 1962, Johnson (1968a), Marks and Miller (1964), Martin, Davidson, and Williams (1965), and Wang (1910).…”