Commutativity: states can be merged in any order; A ∨ B = B ∨ A. If Alice and Bob exchange states, they can each merge the other’s state into their own and arrive at the same result.
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What's special about the Shark UV Reveal?It's in the name: The Shark UV Reveal uses a UV light to detect stains on the floor that we wouldn't see with a casual glance down. That could be anything from those super-faint water stains on the bathroom floor, to sticky residue from a kitchen spill you thought you wiped up, to invisible droplets of dried pet pee. If there were ever a robot vacuum for Dexter Morgan, it would be this one.
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（二）为防止或者减轻船舶油污损害采取预防措施所发生的费用，以及预防措施造成的损失；