premise: Billy was 6, and just learning to read.
initial: His parents took him to the library.
counterfactual: He read of an isolated cave nearby and walked there.
original_ending: Billy was amazed how many books there were! They stood in line for his library card. Billy picked up several books to take with him.
edited_ending: Billy was amazed how many sea shells there were!He hung out at the cave all day.Billy picked up several sea shells to take with him.<SEP>Billy was amazed by the cave.He and his father stood looking at the cave.Billy picked up several rocks to take with him.<SEP>Billy was amazed how many books there were in the cave randomly.He kept reading at the cave.Billy picked up several books to take with him from the cave.