| http://www.w3.org/ns/prov#value | - a) determining, by a computer system including at least one computer and for each of a plurality of ads, an ad preference value as a function of performance information associated with the ad and a maximum cost for a result bid associated with the ad, wherein the performance information associated with the ad is selected from a group consisting of (i) a selection rate of the ad, (ii) a conversion
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