Anchor: RIFs would be used only as a last resort.
Entailed: Only as a last option would RIFs would be used.
Contradiction: RIFs should be used regardless of emergency level.
Contradiction: Two people are watching an airplane in the sky.
Contradiction: Nakadake is the only remaining active craters.
Contradiction: I don't know, it seems pretty tame to me.
Contradiction: The mail system was even more crucial than trade.