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: Although al Qaeda was behind the 1998 attack that killed more than 200 people , Al-Shabaab has killed many more Kenyans and is by far the country 's most persistent tormenter , according to a University of Maryland study . 2: In short succession , bombs detonated at U.S . embassies in Kenya and Tanzania back then . 3: Al Qaeda 's 1998 attack on the U.S. Embassy is the single largest , but Al-Shabaab have killed many more Kenyans .

1: the 1998 attack 2: bombs 3: Al Qaeda 's 1998 attack on the U.S. Embassy