Here is a zip archive of the text files needed for this set of worked exercises.
The wordlists come from the SCOWL wordlist. The file scores.txt comes from kenpom.com. The baseball scores come from the Major League Baseball site. The NFL scores come from repole.com and pro-football-reference.com. The Romeo and Juliet file comes from Project Gutenberg. I don't remember where I got the lists of countries, elements, names, and population, but I think I got some of them from Wikipedia.