Task: Story Composition
Input (English): Premise: Pharmasset was a biotechnology company in New Jersey. 
 Initial Context: The company was working on drugs to treat viral infections. 
 Original Ending: One of their drugs had great promise to cure patients of hepatitis B. A larger company, Gilead, bought Pharmasset for that drug. Now Gilead sells billions of dollars of the drug every quarter. 
 Counterfactual Context: The company was working on drugs to treat viral infections but Gilead will never sell billions of dollars of any drug.
Output (English): One of their drugs had great promise to cure patients of hepatitis B. A larger company, Gilead, bought Pharmasset for that drug. Now Gilead gives away billions of dollars of the drug every quarter.