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: Viktor could not get his microscope to focus. Sentence 2: His professor came to help. Sentence 3: His professor also could not get it to focus. Sentence 4: The professor wiped the lens with a solvent. Sentence 5: He was then able to focus the lens.

Clean Microscope