Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Bob was eating dinner when he felt Something funny in his mouth. As he was chewing he bit down on Something hard. He spit out the piece and found out it was part of his tooth. It did not hurt so he kept eating. About a week later his tooth felt funny because it was so jagged.
 selected sentence: He spit out the piece and found out it was part of his tooth.

Bob bites Something hard >Causes/Enables> Bob spits out a part of his tooth