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Notes on determining "known words"

Schooling and workshop are easy words according to the text but are not in easy_words.py. Checking with the book, it's the same as the python file:

"schooling" is not in the easy words list on p. 26. "school" is, though. "workshop" is not in the list (p. 29). "work" is. (?)

On p. 16 is the note:

Consider as known words on the list with endings indicated in parentheses and words with the following endings, even though they are not noted in parentheses:
-'s, -s, -es, -ies; -d, -ed, -ied, -ing; -r, -er, -est, -ier, -est.
(For further instructions, see pages 13–15.)