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 ) As a well-traveled photographer , Pieter ten Hoopen is no stranger to refugee camps . 2: But he never experienced any like the Mayo camp , which is outside the Sudanese capital of Khartoum . 3: Pieter ten Hoopen took portraits of refugees at the Mayo camp in Khartoum , Sudan .

1: refugee camps 2: the Mayo camp 3: the Mayo camp in Khartoum , Sudan