A kindly source for this blog who prefers to remain anonymous shares something interesting with me, "Years ago, I ran a word count on Illuminatus! and sorted some of it, probably useless but sharing anyway."
Sorted word count. (This is the bit I found interesting).
"One more odd old fileset for you: words that contain 'eris', words that contain 'e-r-i-s' (letters in a row, but separated by other letters), and a 'puzzle' for people to try to discover 'eris. in the words."