Exactly who or what the Weird Sisters were Harry didn’t know, never having had access to a wizard’s wireless, but he deduced from the wild excitement of those who had grown up listening to the WWN (Wizarding Wireless Network) that they were a very famous musical group.
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She trusts only what she can measure or can deduce from measurement.
Now let us consider the situation and see what may be deduced from it.
Arthur Conan Doyle -- The Adventures of Sherlock Holmes