You will be given a definition of a task first, then some input of the task.
In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen after that sentence. Is any of them directly caused by it, or is made possible by it? 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. Do not change the main selected sentence in your answer.

story: Fred took out a piece of paper and wanted to divide it in two. He used a ruler to measure the length of the paper. He wrote down that number on the paper itself. With math, he divided that number in two. Fred made a mark on the paper of half its length and drew a line.
selected sentence: He wrote down that number on the paper itself.
Output:
Fred writes a number on a piece of paper >Causes/Enables> Fred divides the number by two