Definition: 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 _. Your answer should be chosen from the given text, and should not contain other words.
Input: Javier Esposito:  Beckett 's not here . She 's at the police academy working a high - profile murder . One of the recruit officers was killed .
Richard Castle: That 's a little close to home . These the suspects ?
Javier Esposito: Yeah , and three more recruits just alibied out .
Richard Castle: Your victim was killed by a fellow recruit ?
Javier Esposito: Appears so . And word is these _ four _ were watching the fights at a local boxing gym at the time of the murder , but that alibi 's soft .
Kevin Ryan: Hey . Just spoke with Liz from Vice . The boxing gym is a notorious hot spot for illegal steroids . Rumor has it is that one of the trainers was dealing to a cop at the academy .
Richard Castle: So the victim , Bardot , stumbled onto a dirty cop .
Kevin Ryan: Well , that would explain the threatening note . " Dead men tell no tales . "
Richard Castle: But Bardot would n't back down , so the cop kills him .

recruits