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: Spock:  They remind me of the lilies of the field . They toil not , neither do they spin . But they seem to eat a great deal . I see no practical use for them .
Dr. McCoy: Does everything have to have a practical use for you ? They 're nice , they 're soft and they 're furry , and they make a pleasant sound .
Spock: So would an ermine violin , Doctor , but I see no advantage in having _ one _ .

violin