It was first successfully concluded on 26 March 2012 by a 12-year-old American , Tom Schaar .
It was first successfully completed on 26 March 2012 by a twelve-year-old American , Tom Schaar .
It was first successfully completed on 26 March 2012 by a twelve-year-old American , Tom Schaar .
이 문장을 바꿔보세요: It was first successfully concluded on 26 March 2012 by a 12-year-old American , Tom Schaar . 산출: