| http://www.w3.org/ns/prov#value | - Well, again, Martians aside, most everyone reading this will have heard of the betting exchanges - and especially betfair.(Incidentally, if you bet on horses or football and you do not have a betfair account, you are missing out on the best odds on pretty much every horse or team in every race or competition).The point about betting exchanges is that you may have only ever used them to get the best
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