Definition: You will be given three sentences. Read them, then identify a noun phrase (person, place, or thing) or event that is shared between all three sentences. As the output, write the span of the text corresponding to that phrase in each sentence. Keep the order of the sentences, that is, your answer should look like: 1: *a phras from sentence 1e* 2: *a phras from sentence 2* 3: *a phrase from sentence 3*
Input: 1: The size of the SFRA airspace is designed to be large enough to give our defense forces enough time to determine if a threat exists from an aircraft entering it , an opportunity to identify the threat , and if necessary , to divert or eliminate it . 2: So how does a flying machine that looks like a sophisticated lawn chair with helicopter blades invade such highly restricted airspace , as happened Wednesday , when a postal carrier from Florida landed a single-person aircraft on Capitol grounds ? 3: Les Abend : How did gyrocopter fly on to Capitol grounds when FAA , defense forces keep tight rein on airspace ?

1: an aircraft 2: a flying machine 3: gyrocopter