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Step 1

I think Rabinowitz's strategy is to try to establish that Lynch did read - and so know - things he has said earlier he did not know.

(Rabinowitz hopes to prove that Lynch knew Autonomy was fraudulently bulking out its revenues to make itself look like a tempting takeover target.)

Step 2

Building on that he can then say that he has had a controlling hand and influence over other things

(Rabinowitz hopes to prove that Lynch influenced or controlled the bulking out of revenues at autonomy)

Step 3

Then he can claim that Lynch committed fraud

... Looks like he is stuck on step 1