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: When the summer came, Rico had to move back home. He was sad because he had made many new friends in Iowa. On the last day of school, Rico exchanged addresses with his friends. When Rico arrived home, he already had letters waiting for him. Rico has many new pen pals that he writes to every week.
 selected sentence: When the summer came, Rico had to move back home.

Rico's family decides to move home >Causes/Enables> Rico has to move