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Probably because it's redacted.
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Right. But what about
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a search for blacked-out 8-letter words
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the same length as "Valkyrie"?
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Aren't all 8-letter words the same length?
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Well, not in a proportional font like Times Roman.
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Each character will vary in size
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from the narrowest-- a lowercase "I"--
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to the widest-- the uppercase "W."
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So the combination of letters in the word "Valkyrie"
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will create a very specific length,
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Not unlike a typographical fingerprint.