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HOUSTON — For the doubters, the story behind the Rockets’ unbeaten start is about who Houston hasn’t beaten, rather than the teams they have. There is some logic to that, of course. The Rockets are 6-0, but the Lakers, Jazz, Sixers and Celtics are a combined 3-16 entering Friday. And the Spurs, whom the Rockets romped past in Thursday’s nationally-televised showdown, were missing Tim Duncan and Manu Ginobili. Of the six wins, only the rested Heat in Miami, where the Rockets