Pretty sure the green area is supposed to be the overlap of (1) and (2). 🙃
So, it's people who know what both a Venn and a Euler diagram are, but don't necessarily know the difference. One could argue that if you're in (1) and/or (2), you could reliably answer a quiz question correctly for what a Venn and/or Euler diagram is, therefore you wouldn't confuse the two.
So, maybe (3) could expand down like an hourglass, so that part of it is on the overlap and part of it is outside of both (1) and (2)...
Yeah, that's the funniest thing to me. There's an actual fruit that we could eat. Instead, we take the seed, roast it, grind it and soak it in boiling water. Then we drink the water.
You couldn't disrespect the coffee plant more, if you tried.