| http://www.w3.org/ns/prov#value | - How do I know it didn't all just become a dream twenty years ago, and the very notion of time that gives rise to an impression of 'twenty years ago', is not that in itself just something I woke up with today, and if I woke up with it yesterday and the day before it is only because I woke up with it today that I even think there was a yesterday and a day before.
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