I got question 670 correct because I guessed. Wheh... But I have no idea why it was right over the other option. Is there anybody out there who may be able to assist? Thank you very much:
Put in the not rules. W and V can only have two combinations. W is always on the inside 2 or 4 and V is on the opposite side of x, 5 and 1, respectively. That's why w is always the one bracketed.