Task: Story Composition
Input (English): Premise: Rick wanted shiny white teeth! 
 Initial Context: He hates how dull his teeth always looked. 
 Original Ending: Then his aunt suggested he try brushing with baking soda. Rick was skeptical, but he began following her advice anyways. And in under a month, his teeth had become noticeably whiter! 
 Counterfactual Context: He tried baking soda, but it didn't work.
Output (English): Then his aunt suggested he try brushing with whitening toothpaste. Rick was skeptical, but he began following her advice anyways. And in under a month, his teeth had become noticeably whiter!