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I have found it impossible to include a recommended first dosage in good conscience ... In Iraq , U.S. intervention has fanned the flames of civil war , making it impossible to establish a stable and peaceful environment . This behavior was sometimes painful to developers , both because source was not always available and because the static nature of this method resolution algorithm sometimes made it impossible to choose a different method resolution at each invocation site . there 's no escaping the giant maw of the rotary schedule , making it impossible to organize a truly coherent , integrated program for at-risk students . They cannot survive in the dark water at the base of the reef — making it impossible to build a large reef from the bottom up .