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: ( CNN ) Two more American aid workers who had high-risk exposure to Ebola in Sierra Leone arrived back in the United States on Monday for monitoring . 2: Eight of their colleagues have already been flown back to the United States , where health authorities are watching them closely for signs of the disease , according to the Centers for Disease Control and Prevention . 3: Eight aid workers have already returned , and two more are back Monday .

1: Two more American aid workers who had high-risk exposure to Ebola in Sierra Leone 2: their 3: two more