Instructions: In this task you are given a short story and a question regarding that story. You must answer the question based on the events of the story. Try to use the same words in the story to answer each question. You should completely answer the question in a short answer. Do not include information that is unnecessary to answer the question.
Input: I was hiking in a forest. I had to cross a stream. I decided to build a bridge out of dead wood. I started to cross the bridge. The bridge collapsed and I fell into the stream.
Why did I decide to build a bridge out of dead wood?
Output:
I had to traverse a stream.