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As American troops begin their partial withdrawal from Iraq this week, the war begins a new process of wiggling its way into the history books. But exactly how future generations will view America's time in Iraq -- now seven years, three months and counting -- is under debate.

To make sense of it all, experts usually turn first to numbers. Lives lost, money spent, measures of success: For any war, these statistics, or metrics, can begin to paint a picture of an era.

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