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: Dalek #1:  We could let this catastrophe destroy the Thals .
Dalek #2: Will they let themselves starve to death ?
Dalek #1: No . I feel preserving our prisoners was a good idea .
Dalek #2: And an arrangement to bring the Thals inside our city an even better _ one _ .
Dalek #1: We 'll let our prisoners sleep and then give them food . After that , we can plan .
Dalek #2: Why not begin now ?
Dalek #1: Because the lapse of time , the relation of sleep , the provision of food , all these things will give them a false sense of security .

idea