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: Roberts -- who shocked conservatives nearly three years ago by providing a pivotal vote to uphold Obamacare -- once again faces a judicial crossroads in a historic case . 2: Appeals courts nationwide have moved decisively toward supporting same-sex marriage , but a split at the appellate level helped propel the issue to the nation 's highest court , led by Roberts . 3: John Roberts is at judicial crossroads as high court to hear key same-sex marriage case .

1: a historic case 2: the issue 3: key same-sex marriage case