Text: Its construction for the World's Fair of 1889 was an astounding engineering achievement ' 18,000 pieces joined together by 2,500,000 rivets, soaring 300 m (984 ft) into the air but standing on a base that is only 130 m (1,400 ft) square.
Entailment: 18,000 pieces are fastened together by 2,500,000 rivets.
Contradiction: The tower was an engineering marvel, and took only 5,000 pieces to complete.