Load dictionary to validate words
Validate each word
Track how often each word is used

Start of algorithm change. Rather than trying to find words unique to
each person, find words each person uses the most. First, track the
number of times each word is used so the common words can be removed.
Rebase after 2a0657e05272ec729f2f05e82c13e374a608dc69
Pass in word_usage to remove common words
Require 100 words to determine a word fingerprint
Print each person's top five used words