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: Now CyArk , a non-profit company founded by an Iraqi-born engineer , is using groundbreaking laser scanning to ensure that -- at the very least -- incredibly accurate digital versions of the world 's treasures will stay with us forever . 2: Since then , Kacyra has been doing exactly that : in a 2011 TED talk he explained his quest to preserve our  collective treasure  , and he has a plan to scan 500 World Heritage sites in five years . 3: Founded by an Iraqi-born engineer , it plans to preserve 500 World Heritage sites within five years .

1: the world 's treasures 2: 500 World Heritage sites 3: 500 World Heritage sites