Definition: In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.
Input: Sentence1: There once was a very special raven. Sentence2: This special raven could speak. Sentence3: The raven could only say one word though. Sentence4: The word the raven could say was 'Nevermore'.

This proved to be a very useful phrase.