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*

Positive Example 1 -
Input: 1: Four employees of the store have been arrested , but its manager -- herself a woman -- was still at large Saturday , said Goa police superintendent Kartik Kashyap . 2: If convicted , they could spend up to three years in jail , Kashyap said . 3: The four store workers arrested could spend 3 years each in prison if convicted .
Output: 1: Four employees of the store 2: they 3: The four store workers

Positive Example 2 -
Input: 1: Stewart said that she and her husband , Joseph Naaman , booked Felix on their Etihad Airways flight from the United Arab Emirates to New York 's John F . Kennedy International Airport on April 1 . 2: The couple said they spent $ 1,200 to ship Felix on the 14-hour flight . 3: Couple spends $ 1,200 to ship their cat , Felix , on a flight from the United Arab Emirates .
Output: 1: their Etihad Airways flight from the United Arab Emirates to New York 's John F . Kennedy International Airport 2: the 14-hour flight 3: a flight from the United Arab Emirates

Negative Example 1 -
Input: 1: Stewart said that she and her husband , Joseph Naaman , booked Felix on their Etihad Airways flight from the United Arab Emirates to New York 's John F . Kennedy International Airport on April 1 . 2: The couple said they spent $ 1,200 to ship Felix on the 14-hour flight . 3: Couple spends $ 1,200 to ship their cat , Felix , on a flight from the United Arab Emirates .
Output: 1: she and her husband 2: couple 3: Couple

Negative Example 2 -
Input: 1: But an Arizona official told CNN Bates never trained with the agency . 2:  He did n't come to Arizona ,  the official from the Maricopa County Sheriff 's Office said ,  and he certainly did n't train with us .  3: Maricopa County Sheriff 's Office in Arizona says Robert Bates never trained with them .
Output: 1: the agency 3: Maricopa County Sheriff 's Office in Arizona

Now complete the following example -
Input: 1: It may help scientists better understand why Yellowstone 's previous eruptions , in prehistoric times , were some of Earth 's largest explosions in the last few million years . 2: Volcanic activity triggers 2,000 to 3,000 small earthquakes per year , and the shake and shock waves travel at different speeds through molten , hot and other rock . 3: Scientist measured the thousands of small earthquakes in Yellowstone to scan the earth underneath it .
Output: 



Answer:
1: Yellowstone 's previous eruptions 2: 2,000 to 3,000 small earthquakes per year 3: small earthquakes in Yellowstone