The controls of most modern airplanes can be operated either manually or automatically.
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Blue-greenalgaegrowabundantlyinsaltmarshes.
ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
TheeconomyofDallas,Texas,isstronganddiversified.
HowmanypeopleareawarethatadancerwiththeNewYorkCityBallettypicallywearsoutaminimumoftwohundredpairsoftoeshoesperyear?