You will be given a definition of a task first, then some input of the task.
In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. There are several possible answers, you'll need to choose the proper one. Carefully read the given text, pay special attention to the marked number, think about what (unwritten) information the marked number holds inside, choose the most adequate word(s) from the optional answers. If none of them seems right to you, there's also an option for other. If your answer is "REFERENCE", also write the reference entity, otherwise write the implicit option name. Options to choose from are:
REFERENCE: Some object which is being mentioned in the text before or after the target number. The reference answer has a higher priority than any other. If both Reference and another answer are possible, prioritize the Reference.
YEAR: Describing a calendric year
AGE: Describing someone's age
CURRENCY: Reference to some monetary value e.g dollar, euro etc.
PEOPLE: Describing a single/plural persons
TIME: Describing a time of the day. Usually you can add the word o'clock after those numbers.
OTHER: Some other option, which isn't listed here.

Jennifer Jareau:  Terra Mesa , New Mexico . Five dead , all from Mesa University . No signs of sexual assault , and no sign of theft .
Derek Morgan: Five nineteen - year - olds , minimal defensive wounds . One of them was impaled on a six - foot wooden pole .
Elle Greenaway: Who 'd want to torture five college freshmen ?
Derek Morgan: They were n't tied up and no one escaped ?
Dr. Spencer Reid: No single unsub could 've exerted this much control over so many people .
Elle Greenaway: So you think there were was more than two .
Jason Gideon: I think we 're looking at a pack .
Jennifer Jareau: A pack ?
Dr. Spencer Reid: _ Three _ or more that kill in unison . As in nature , the group dynamic dictates the pack 's survival is dependent on their ability to hunt successfully .
Aaron "Hotch" Hotchner: And as in nature , a pack will keep on killing until it runs out of prey or is stopped .
Elle Greenaway: Stopped by what ?
Jason Gideon: A stronger pack .
Output:
REFERENCE unsub