If you are relatively certain you will not get an offer, touch base informally with one of the recruitment professionals and float the idea of withdrawing your name from consideration because [you want to work in a different city OR you want to try a different law firm OR you want to work in government or a non-profit].
If you are told about not getting an offer before you withdraw your name, you may want to ask if the firm would permit you to withdraw your name from consideration so you can maximize your chances of getting an offer from another firm.
Whether or not you withdraw your name, you must determine how you can get a good reference from the firm. Ask your recruitment professional about the protocol. You also could talk with a lawyer in the firm for whom you believe you did good work and ask if he/she will serve as a reference.
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