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We do not know him.
I know him.
I know him.
I am acquainted with him.
We're acquainted [friendly] with him.
I think that I know him.
It seems that he knows about it.
I am well acquainted with him.
We know his name very well.
I am acquainted with him.
Who knows him?
Do you know him?
We don't know anything about him.
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