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For preservation reasons , all copies of music must be made by Library staff . Our recovery protocols guarantee that if one or more fail-stop nodes crash , all active transactions running on crashed nodes are aborted , but no active transactions running on crashed nodes are unnecessarily aborted . Historically , all states required policies of insurance to be " countersigned " by an authorized resident agent . the Johannesburg World Summit of 2002 , all emphasize the need for enhancing sustainable power supply in the years to come .