You Can't Outrun Them. You Can't Destroy Them. If You Damage Them, The Essence Of What They Are Remains - They Regenerate And Keep Coming.

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You can't outrun them. You can't destroy them. If you damage them, the
essence of what they are remains - they regenerate and keep coming.
Eventually, you will weaken. Your reserves will be gone. They are
relentless.
-- Q to Picard about the Borg, "Q-Who?", stardate 42761.3

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