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 ) They may not be  Star Trek  - type extraterrestrials , but we may be close to finding evidence of alien life , a NASA scientist says . 2:  I think we 're going to have strong indications of life beyond Earth within a decade , and I think we 're going to have definitive evidence within 20 to 30 years ,  NASA chief scientist Ellen Stofan said Tuesday during a panel discussion on water in the universe . 3: NASA chief scientist Ellen Stofan believes we 're close to finding alien life .

1: alien life 2: life beyond Earth 3: alien life