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: Since their young son 's disappearance , the Patzes have worked to keep the case alive and to create awareness of missing children in the United States . 2: In the early 1980s , Etan 's photo appeared on milk cartons across the country , and news media focused in on the search for him and other missing children . 3: The young boy 's face appeared on milk cartons all across the United States .

1: the United States 2: the country 3: the United States