| http://www.w3.org/ns/prov#value | - If you want to know how long the reign of George V lasted, you will probably need to look it up, and you are always in jeopardy of your sources being unreliable. (I am told he reigned from 1910-36, but I would not bet the farm.) But the philosopher's proposition that a reign must last some amount of time or other would seem to be a conceptual truth; being extended in time belongs to the concept of a
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