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: Days earlier , the outfit -- Jund al Khilafa , a splinter group of Al Qaeda in the Islamic Maghreb -- had pledged allegiance to ISIS . 2: Militant group Boko Haram has waged a campaign of terror in mostly northern Nigeria for over a decade . 3: Extremist groups operating in Africa include ISIS , al Qaeda in the Islamic Maghreb , Al Shabaab and Boko Haram .

1: splinter group 2: Militant group 3: Extremist groups