For what we know vs For what we don't know

Some examples from the web:

• The German artillery for what we know
• The German artillery for what we know Belongs to the Duke of Ferrara who delivered to Frundsberg during the night. in boats used to transport salt
• You fight in all our names For what we know is right
• Try to get some more information out of the police in return for what we know about the Cayman Island thing.
• He said he'd bribe me with what he knows about Dani in exchange for what we know about Delarge.
• So I think we should not aim for what we know is already impossible or would bring us into an administrative and otherwise impossible political situation but look for the goes for the whole debate on legislation and regulation and ambitious targets.
• I'm getting tired of chasing you around for what we both know is rightfully mine.
• Mr President, the POSEI programmes were proposed more than 10 years ago as aid instruments for what we now know as the outermost regions.
• For all we know what blew up the Halo ring was a supernova-level event.
• It was moderates being prepared to stand up for their beliefs, it was moderates having the courage and decency to go out there and argue for what we all know is the only way in which you turn off the violence and turn on the peace and security.
• I do believe it is important for us to know what we are working towards.
• If we are to debate this important question today, it is essential to have the amendments that were tabled in the various languages for us to know what we are debating.
• At the very least, they should appear on packaging labels in order for us to know what we are buying, when, for example, we purchase biscuits, chocolate, potato crisps or ice cream.
• We know you for what you are.
• Jimmy knows everything that we know.
• Emmett would also know that we'd know that he knows we know, because he knows that we know that what he knows is that we know he wants us to behave.
• Everything we know about every dragon we know of.
• We know that you're not responsible for what you did.
• We know you for what you are. Yes.
• We know that efforts are now under way in a number of Member States to discuss who will be responsible for what, if and when the millennium bug actually strikes.

Some examples from the web:

• For example, what we don't know about is this CCA deal... ...and all the other CCA deals.
• For what purpose, I don't know.
• You have such contempt for what you don't know.
• Claire, I don't know how to apologize to you for what I've done.
• Graner walks over to one of the detainees, punches him in the temple, for what reason, I don't know.
• He called me Gradiva, for what reason I don't know.
• For what they get for cream, I don't know.
• I don't know for what that stone is good, but it has got its function.
• I don't know if you can blame someone else for what's going on, or blame their anger.
• Look, I don't know how to begin to apologize for what I did.
• You got shortages and overages in the same count, and your fill slips are so sloppy I still don't know who signed out for what.
• I don't know if it helps with your growing pattern, but I was always ready for what came after.
• I don't know the English word for what you are.
• I know Istanbul better than some Turks, and for what I don't know I can always make a friend.
• I don't know for what business you came here for, but if you're done, leave.
• I don't know if I can ever thank you enough... for what you done today, Reverend Daniels, for my baby girl and for me.
• I don't know if it'll mean much, But for what it's worth, I wanted to say I'm sorry.
• I don't know how I can ever repay you for what you've done, Dr. Willet.
• Can't blame a body for what they don't know.
• And Aicha started, and she said, I don't know if my son is guilty or innocent, but I want to tell you how sorry I am for what happened to your families.