This is called social capital and it is essential for the exercise of power and influence.

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And much of this process, of debating what might be done to prevent such tragedies in the future, is an essential ingredient in our exercise of self-government.

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Moving also requires shifting institutional thought, especially the idea in education that physical exercise is in competition with academics for a slot in the curriculum instead of an essential ingredient of academic performance that begins with increasing general physical activity.

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After nearly a decade of declining activity, the Russian military began to exercise its forces in mission areas it believed were essential for deterrence, global reach and rapid reaction.

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