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: Earlier , a stream of people took part in a somber memorial service at the Sakharov Center in Moscow . 2: I just wanted to go to pay tribute to a political personality , Boris Nemtsov .  3: Boris Nemtsov is buried in a Moscow cemetery following a somber memorial service .

1: a somber memorial service 2: tribute 3: a somber memorial service