premise: Alex was trying to build a birdhouse.
initial: He spent almost an hour putting together the walls.
counterfactual: The parts fit together perfectly.
original_ending: When he went to put the roof on, he realized that it didn't fit. He had made a mistake with the walls. Alex decided to start over from the beginning.
edited_ending: When he put the roof on, he was very happy.He had made no mistakes at all with the walls.Alex decided to start over and make another one.<SEP>When he went to put the roof on, he realized it looked perfect.He had made a great choice with the walls.Alex decided to build another birdhouse.<SEP>But when he went to put the roof on he realized that it didn't fit.He had made a mistake with the walls.Alex decided to start over from the beginning.