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The group stage of the FIBA World Cup is over, with 16 of the 24 teams moving on and three of them – the United States, Spain and Greece – still unbeaten. But they cannot afford to lose now. The knockout stage begins Saturday, and it’s pretty much the same as the Sweet 16 of the NCAA Tournament. Win and keep playing. Lose and go home. And being one of the last four teams is something special – in this case,