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: Pat had a song stuck in her head all day. She tried to ignore it but it wouldn't go away. When her mind when blank she heard the song. She tried to listen to the radio until the song was flushed out. After a few country songs she forgot all about the first one.
 selected sentence: When her mind when blank she heard the song.

A song stuck in pat's head >Causes/Enables> Pat heard the song when her mind was blank