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 ) Iraqi forces appear to be slowly closing in on an important tactical victory against ISIS . 2: But as they press forward in their attempt to retake the city of Tikrit from ISIS insurgents , there is an important question that the United States and its allies should be asking : Could this victory actually undermine the only sustainable strategy for ensuring Iraq 's stability ? 3: Iraqi forces have been involved in an offensive to retake Tikrit .

1: closing in 2: press forward 3: involved