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: In February , the  smart bullets  --.50 - caliber projectiles equipped with optical sensors -- passed their most successful round of live-fire tests to date , according to the Defense Advanced Research Projects Agency , or DARPA . 2:  Additionally ,  the statement said ,  a novice shooter using the system for the first time hit a moving target .  3: .50 - caliber bullets equipped with optical sensors can follow moving targets .

1: the `` smart bullets '' --.50 - caliber projectiles equipped with optical sensors 2: the system 3: .50 - caliber bullets equipped with optical sensors