The vehicle's silhouette ascends slightly towards the rear, a visual impression that's reinforced by a widening character line that runs from the headlights back to the taillights.

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But that bottom-line number conceals a widening divergence between the family patterns of the college-educated top one-third, where family life is increasingly stable, and those of the non-college-educated bottom two-thirds, where family life is increasingly disrupted.

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