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: Iraqi and allied forces have made inroads in recent weeks , beating back the group that calls itself the Islamic State , which took over vast swaths of Iraq and neighboring Syria last year . 2: Still , ISIS remains a formidable force and , as the Ramadi assault shows , one that 's still capable and willing to go on offense to take territory . 3: Iraqi and allied forces have had recent success , but ISIS remains powerful .

1: the group that calls itself the Islamic State 2: ISIS 3: ISIS