What to offer on 2nd?

What to offer on 2nd?: "I recently signed a contract subject to a short sale. I have submitted my offer and package to the 1st lender. I am still waiting for authorization for the 2nd. I think I understand that what you offer on the 2nd largely depends on what the 1st will accept so how do I make my offer on the 2nd before I know what the 1st will take?
Thanks for any imput!"
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