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: Sally's cat, Sam, loved playing with string. One day Sam got all caught up in some string while he was playing. He ended up getting so tied up that he could not get free. Sally had to cut the string to get him untangled. Afterwards Sam did not want to play with string anymore.
 selected sentence: Sally had to cut the string to get him untangled.

Sally's cat was so tied up that he couldn't get free >Causes/Enables> Sally had to cut the string to get him untangled