So clearly if this assumption holds, that the Computational Diffie-Hellman assumption holds, because here, the adversary has more power, and as a result we say that this assumption is stronger that Computational Diffie-Hellman, the thing, we really don't like about this assumption, is the fact, that, it's interactive, and that the adversary is allowed to make queries to the challenger, and as I said, we're gonna trying to get rid of this interaction later on. 