Anchor: You can discover the sheer underwater walls in the caldera, or visit the reef off the eastern coast.
Entailed: You can see the underwater caldera walls or visit the reef. 
Contradiction: You can't go to the reef, it is too far away. 
Contradiction: I need to go to the hospital.
Contradiction: A woman is painting
Contradiction: The natural greenhouse effect cools the earth.
Contradiction: Brown was a British editor.