“…1975 Propp envisaged twenty-two tale functions, and nine more in the "preparatory section" of a tale, a part that is sometimes absent. 12 From the controversy concerning story grammars in cognitive science (which was influential in AI), see Black & Wilensky (1979), Rumelhart (1980b), Frisch & Perlis (1981), Wilensky (1983b), and Garnham (1983). Not always Propp's transformation function is intended as a disguise disabling recognition on the part of other characters.…”