Task: Story Composition
Input (English): Premise: I used my ruined treehouse to build a fort. 
 Initial Context: I only had to buy six more boards. 
 Original Ending: These I buried in the ground as supports. Then I constructed a house out of the old wood. The new fort is twice as good as the old treehouse. 
 Counterfactual Context: I only had to buy some flags for the fort.
Output (English): These I buried in the ground as proof of my territory. Then I constructed a house out of the old wood. The new fort is twice as good as the old treehouse.