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: Karl noticed a stain in his pants. He didn't know what it was. He reached into his pocket and his had became covered in ink. His pen had broken. It leaked all over and he had to buy new pants.
 selected sentence: Karl noticed a stain in his pants.

Karl looks at his pants >Causes/Enables> Karl notices a stain