One day, Charley got late from his office. He wanted to reach home soon. Therefore, he went to the Grand Central to catch a train. He walked down to the first level, and then walked down another flight of stairs. He thought he had reached the second level again, but he got lost. He walked down a corridor. He thought it was wrong, but he walked on downward. He walked down a short flight of stairs. He thought that he had reached the second level again. However, actually he had reached the third level.