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: My wife bought a Keurig in 2012. We used Mister Coffee styled coffee makers until then. I was home alone often and it was hard to make a single cup. My wife had a coupon and she bought the Keurig. It has served our purposes nicely.
 selected sentence: It has served our purposes nicely.

My wife buys a Keurig >Causes/Enables> The Keurig serves it's purpose