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: Two boys bought a tub of popcorn at the movie theater. Every time one boy grabbed some, the other would too. They each took turns eating the popcorn. They ended up eating the same amount each. The boys got a refill on popcorn and did it again.
 selected sentence: They each took turns eating the popcorn.

Two boys bought popcorn >Causes/Enables> Two boys took turns eating the popcorn