Having said that you can do it with one - you'll usually get a better result with 3.
If the one exposure that you're using has some totally blown highlights or blocked up shadows even shooting in RAW wont recover them. I usually use three at -2ev, 0ev & +2ev although sometimes in very high contrast conditions I might go to -3 or -4ev.
Setting the camera for high speed, auto bracketing and using the auto align feature in photomatrix I find I can get away with hand holding
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