JAKARTA, Indonesia • At least 40 percent of Japan's 22,000-milecoastline is lined with concrete sea walls, breakwaters or otherstructures meant to protect the country against high waves,typhoons or even tsunamis. But the devastation from Friday'searthquake, and a final death toll predicted to exceed 10,000,could push Japan to redesign those walls — or reconsider its heavyreliance on them altogether.

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