Hi Steve, thanks for the response, but I was tackling Jamie and gdelgado's agreement that both phrases

"In a depth-first traversal, node i comes before node j"

and

"I is lower in the tree than J"

are equivalent but one is 'worded nicer' and therefore the 'accepted answer'.

I was presenting a counter-case where one was true and the other wrong to show that they aren't just equivalent, but in fact your question was subtle and the answers weren't word-play tricks a-la MCSE questions.

🙂