Task: Story Composition
Input (English): Premise: Nate asked Benny who took his wallet. 
 Initial Context: Benny told him that his mom had the wallet. 
 Original Ending: However, Nate's mom said that she didn't have anything. Nate returned to Benny to ask if he was lying. When they met, the wallet was in his hand. 
 Counterfactual Context: Some guy mugged him on his way home from work.
Output (English): However, Nate's mom said that she had his wallet. Nate returned to Benny to ask if he was lying. When they met, the wallet was in his hand.