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: Todd wanted a boat. He decided to build one. He cut down a tree. Next he cut up the tree. Last he nailed the together.
 selected sentence: Last he nailed the together.

Todd decides to nail >Causes/Enables> Todd nails