A medium tells his employer about the woman he was with.

I scanned her. she doesn't have
your artifact. I know that much. Meaning he knows only that?
Yes, that seems to be the meaning in the given context.
But in another context, it might mean something different.

Could be. Sometimes we use it to mean I know at least that much. Could be either one, in this case - without further context.

- A.
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