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: Piper Halliwell:  So ... who 's bright idea was this , anyway ?
Phoebe Halliwell: We were trying to save you .
Piper Halliwell: Yeah ? Good job on that one .
Phoebe Halliwell: And who went and got her head stolen ?
Piper Halliwell: While you were off contemplating your navel , while you still had _ one _ ...
Paige Matthews: Guys , we are not getting anywhere arguing .
Piper Halliwell: Actually , we 're not getting anywhere because we do n't have any bodies .
Phoebe Halliwell: Okay , look . We said we were sorry .
Paige Matthews: Can we try looking on the bright side ? I mean , you know , we 're still alive .
Piper Halliwell: Only 'cause Zachary ca n't kill us in here .
Paige Matthews: I do n't think he would if he could . I mean , he practically apologized to us .
Phoebe Halliwell: I think she 's right , actually . I did n't sense any anger from him , just a lot of sorrow .
Piper Halliwell: So , what ? He did this to us just to get us out of the way ? To do what ?
Phoebe Halliwell: To get revenge on the school .
Paige Matthews: And Gideon .

navel