Input (grade 11): Berg attended the first production in Vienna of BÃ 1\/4 chner's play on 5 May 1914, and knew at once that he wanted to base an opera on it.
Output (grade 5): Berg knew at once that he wanted to make the play into an opera. BÃ 1\/4 chner, who had died in 1837 at the age of 23, had left the play unfinished.