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.

Ex Input:
story: Sam decided he wanted to ride his bike to work to get some exercise. Sam didn't often ride his bike and had forgotten how to use the gears. Getting to work was simple since it was all down hill. Going home was difficult since the ride was all uphill. He arrived home exhausted and decided to practice gear-shifting.
selected sentence: Going home was difficult since the ride was all uphill.

Ex Output:
Sam forgets how to use the gears >Causes/Enables> Going uphill is difficult

Ex Input:
story: I just made myself some popcorn as a snack. The doorbell rang as soon as I sat down to eat. It was my mailman delivering a package. When I came back my popcorn bowl was empty and my son was laughing. I guess I have to make more popcorn if I want my snack.
selected sentence: The doorbell rang as soon as I sat down to eat.

Ex Output:
mailman arrives at door >Causes/Enables> doorbell rings

Ex Input:
story: Billy was three years old. He loved to play with blocks. He only had one set to play with. His father bought him a new set to play with. He now has more blocks than he knows what to do with.
selected sentence: He only had one set to play with.

Ex Output:
Billy's parents buy only one set of blocks >Causes/Enables> Billy plays with only one set of blocks