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.

Burt Munro: I ca n't get my leg in because of the asbestos cloth on it . Let me take it off .
Rolly: What about your leg in the heat ?
Burt Munro: Screw it . I 've got a spare _ one _ .
leg