Text: In 1854 Perry duly negotiated the Treaty of Kanagawa (now part of Yokohama), opening up two ports, Shimoda on the Izu Peninsula and Hakodate in Hokkaido.
Entailment: A treaty opening up ports in Shimoda and Hakodate was negotiated in 1854.
Contradiction: The Treaty of Kanagawa resulted in 10 ports being opened.