When Joyce first made this, she played it in Radical Unschooling Info, confirming right guesses. I don't know how to map her original art for clicks, so admire that, and then look at the larger letters. After you think you've identified one (or have given up) click it for the answer and some context! Each will go to a separate page, so you won't accidentally see answers you didn't want to see yet.
Joyce and I were both born in the 1950s, so if you're much younger than that, think re-runs!