* Atlanta remains NFL's only unbeaten team * Giants avenge early-season loss to Cowboys * Bears nip Panthers for fifth win in row (Updates with Giants beating Cowboys) Oct 28 (Reuters) - The Atlanta Falcons extended their unbeaten start to the National Football League season to seven games with victory over the Philadelphia Eagles on Sunday. Showing no signs of complacency or rustiness after having a week off, the Falcons coasted to a comfortable 30-17 win with quarterback Matt Ryan passing for 262 yards and three touchdowns. ...

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