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Arriving at the third carriage, Yu Qian'an saw the iron-clad door of the fourth carriage. He opened the door and saw that the four sides of the carriage were trapezoidal, tilted inward at about fifteen degrees. There were no doors on the sides, only two doors at the head and tail. There were ten shooting holes on each side of the twelve-meter-long carriage, plus two on each side, for a total of twenty-four shooting holes.