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Unless I missed something, it matches if you don't treat it as a directed graph. Edge (1,6) accounts for both (1,6) and (6,1) in that case.

You didn't miss anything. This is why these are good interview questions, because it weeds out the people who are asleep.

Has the image changed or something? In its current state, I have a hard time seeing how anybody could misunderstand it...

Congrats! You passed the test ;)

Yeah, they fixed it... +1