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: Vala Mal Doran:  Our only chance is to take this ship back .
Lt. Col. Samantha Carter: I have an idea about that , but it 's pretty risky .
Vala Mal Doran: It 's probably better than our plan .
Lt. Col. Samantha Carter: Well , what 's your plan ?
Dr. Daniel Jackson: We do n't have _ one _ .

plan