Anchor: With safe harbors and wide fertile plains, it could both protect and feed its people.
Entailed: It can feed its people as it has fertile plains.
Contradiction: The harbors are not safe and the plains incapable of growing food.
Contradiction: People are climbing on a boat
Contradiction: Tell your friend that you don't want to discuss the subject.
Contradiction: He actually has no opinion on them at all.
Contradiction: There is a woman on a subway.