Exercise 4.49: Alyssa P. Hacker is more
interested in generating interesting sentences than in parsing them.  She
reasons that by simply changing the procedure parse-word so that it
ignores the “input sentence” and instead always succeeds and generates an
appropriate word, we can use the programs we had built for parsing to do
generation instead.  Implement Alyssa’s idea, and show the first half-dozen or
so sentences generated.258