| http://www.w3.org/ns/prov#value | - If we say that Nadal is the greatest clay courter and Federer is the greatest player on grass and we acknowledge that Nadal has done more on Federer's turf than Federer has done on Nadal's turf then how can we reach a conclusion other than the one I reached, namely that Nadal is greater than Federer?
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