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: Richard Castle:  I do n't think date night counts when it 's a candlelit dinner with the butcher of Guadalajara .
Kate Beckett: Well , I 'll ... I 'll plan something else .
Richard Castle: Something else ?
Richard Castle: You
Richard Castle: did n't have a plan !
Kate Beckett: Do you realize how pressure - filled this is , always trying to top each other ?
Richard Castle: That 's half the fun of it ! Our rivalry is what fuels the passionate fire ...
Richard Castle: Rivalry
Kate Beckett: .
Kate Beckett: What ?
Richard Castle: Rivalry . Between two brothers .
Kate Beckett: What ? What rivalry ?
Richard Castle: The _ one _ between Jorge " El Oso " Zamacona and his brother Hector .
Kate Beckett: A rivalry would explain why Zane was working with both brothers . But how ... how do we prove it ?
Richard Castle: I just need to find one piece of evidence to see that I 'm on the right track .
Richard Castle: And
Richard Castle: that could be it .

rivalry