aardvark, and they develop the tree up to
the point where aardv has been read and processed).
Starting with the book's aardv tree, finish the processing of
aardvark: show the completed tree as well as the complete
output string. Be sure to show your work, carefully, so it's easy for me
to tell what you're doing. (Note that you can just denote the NYT letters
as themselves; you don't need to use the book's fixed-length coding
scheme.)