Maze [ This listing was incomplete in the PDF of the book. It was missing several lines in the middle of the program. I cannot be certain whether this misprint was present in the book itself or is a mistake in the conversion to PDF, but I suspect the former. There seems to be no blank space in the PDF where any lines could have been erased; the page numbers, in any case, preclude an entire missing page. Whatever the cause, I have had to supply (only a few) lines myself, to produce a complete game. The result is called "Maze". Should anyone feel moved to complete the program in their own preferred way, the program called "Maze orig." is the original, incomplete listing. ]