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 expedition was launched after aerial light detection scanning -- known as LIDAR -- uncovered what appeared to be man-made structures below the rainforest , National Geographic said . 2: Writer Douglas Preston said the team emerged February 25 , after documenting the ruins of a  vanished culture .  3: A team documented the site after aerial light scanning showed man-made structures .

1: man-made structures 2: the ruins 3: man-made structures