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: Alexis Castle:  How do you get away with one murder by committing two more ?
Richard Castle: At one death , you look for motive . At _ two _ , you look for a connection . At three , you look for someone like Kyle . At three , you do n't need motive , because mentally unstable serial killers do n't usually have one .

death