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Event-driven reactions can be triggered and determined by a variety of options such as file origin , naming conventions , or absence or presence of certain data such as text or images . A public transit system is under construction that will provide a variety of options for residents and visitors to select in addition to automobiles . With more flexibility , ACA members could offer a variety of options to their customers , including sports tiers , family-friendly tiers , contemporary adult tiers , children 's tiers , and a la carte access to a few of the highest cost channels . The Air Force Association believes the government should face its responsibility and make a variety of options for affordable , portable , and accessible health care available to active duty and retired members and their families .