| http://www.w3.org/ns/prov#value | - Using naive coin toss calculation, the probability of both test being accurate is 0.9*0.9 = 0.81, but the possibility of both being false is 0.1*0.1 = 0.01, which does not add up to 1 because the outcome where only one of the tests is wrong is impossible in this case.
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