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: Lucy bought a brand new outfit for school. The next morning she proudly dressed in her new clothes. Lucy walked to school carefully through the slushy snow. As she climbed the school stairs she slipped and fell. Lucy cried when she saw mud covering her new pants.
 selected sentence: As she climbed the school stairs she slipped and fell.

Lucy walks to school >Causes/Enables> Lucy climbs the school stairs