It resides in the specific and exact knowledge of those people who actually do whatever it is.

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Tying that knowledge to the exact genetic sequence will be a big step forward.

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This involves searching for close, though not exact, matches in the DNA database, in the knowledge that such hits could represent family members of a suspect.

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"I don't know the exact ages of the women ... at least to the best of my knowledge, they were all adults, and they were engaging in conversations consensually, " Weiner said Monday.

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