Definition: In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.
Input: Sentence 1: Tim built a treehouse. Sentence 2: He wasn't very good at it. Sentence 3: It was a pretty dangerous place. Sentence 4: Tim played there often. Sentence 5: He loved it up until it collapsed.

Broken Treehouse