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: Ashley Cowan:  Ah , Captain ... is it Grey Holden or Holden Grey ? I never can ...
Captain Grey Holden: What are you doing here , Cowan ? Did you run out of riverboats to be thrown off of ?
Ashley Cowan: Why , Captain , I 've never been thrown off this _ one _ , have I ?
Captain Grey Holden: That 's only a technicality . I 've never caught you cheating .
Ashley Cowan: And you never shall .

riverboats