In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.
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Question: when did billy elliot the musical come out

Answer: 2005


Question: when was the a* introduced at a level

Answer: 2010


Question: who won the nbc world of dance 2017

Answer:
Les Twins