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: Lan walked to the beach. She walked through the sand until she was up to the surf. Lan stepped into the water where it was almost to her knees. She tried to walk further where the water was above her chest. The waves splashed her back to the shore.
 selected sentence: She walked through the sand until she was up to the surf.

Lan walks to the beach >Causes/Enables> She walks among the sand up to the surf