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: Joe Pedowski:  You 're gon na try to fly this thing back ?
Captain Cody Briggs: Joe , did you ever skip a flat rock across a lake and watch it skim and bounce along the surface ? I wanna give reentry that kind of shot .
Joe Pedowski: I have skipped a few rocks on a few lakes in my time and I never saw yet _ one _ that did n't sink . It 's one chance in a million .
Captain Cody Briggs: So was this accident .
Joe Pedowski: I am scared out of my mind being up here inside this plane and you want me to go outside ? oh no ! I 'll need a wire stripper and some wire nuts ... and a dry pair of pants when I get back .
Joe Pedowski: can not unselect the speaker .

rock