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: Francisco hadn't seen his mother in Years. He saved up money diligently for the flight to her home in Iowa. Finally the day had come for Francisco to fly to Iowa. He and his mother were very happy to see each other. Francisco promised he would never wait so long to see her again.
 selected sentence: He saved up money diligently for the flight to her home in Iowa.

Francisco hadn't seen his mother in years >Causes/Enables> Francisco saved up money to visit his mother