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He has AAxx 100% of the time. I am getting the correct odds to call preflop, so I can call here. You can't think of any reasons I would want to see the flop before I put my last $40 in?

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So, you know 2 of his hole cards, and none of the suits. About the only flop I would consider folding to is A-small-small with none of my suits. Given that this flop would come down very, very infrequently and I know that my opponent will be putting in the rest of his stack no matter what, I would probably elect to get it all-in pre-flop to save myself the mental anguish I would have when the flop came down: A-Q-x-x or A-10-x-x or Ah-xh-x-x or As-xs-x-x and I would still have to call.