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: A spy wrote a secret message on a piece of paper. He then folded it up and placed it in a library book. He took the book back to the library and hid it in the stacks. Soon after, another spy picked up the book. He flipped through the pages and took secret message.
 selected sentence: He took the book back to the library and hid it in the stacks.

The spy checks out a book >Causes/Enables> The spy returns the book