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: Joe and his friends were playing one day. Joe seen Something on the hill above them. They ran to see what it was. It was a huge flat rock. Now that is their play rock.
 selected sentence: Now that is their play rock.

Joe and his friends find a huge flat rock >Causes/Enables> Joe and his friends play on the huge flat rock