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: The old farmer had two mules and one plow. Both mules like pulling the plow for the farmer. Each day the farmer worried about which mule to used. One morning he saw both mules standing together. He got the idea to hooked both mules to the plow.
 selected sentence: The old farmer had two mules and one plow.

The old farmer buys a plow >Causes/Enables> The old farmer has a plow