@CScheresky Yes! Wish they pulled this earlier rule into this lesson as well instead of a new rule

on Q2 with the ice on the sidewalk, why is it not invalid for being inverse of the relationship established? The diagramming led us to If there is ice -> sidewalk is not open to the public. This is a different necessary condition than If sidewalk open to the public -> it doesn't have ice. What am i missing here?

@ckelly95 if you google 7sage blind review they have a whole explanation of how to do this. besically you take the quiz, dont look at your score, retake the quiz with unlimited time (blind review), and then see the difference between your score when you had limited time vs. unlimited time.