My father was 71 at the time and looking no older than the man in the portrait, and I was but 14, yet I remember deducing in that instant that my father secretly wished the Duke had been his son, and disliked the political necessities that made them enemies.
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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