Anchor: Doctor is performing a surgery.
Entailed: Doctor is working on a patient
Contradiction: Doctor is washing his hands preparing for surgery
Contradiction: He's getting some big ideas that he should build some oil wells in this town. 
Contradiction: They are talking about the position itself, not the person filling said position,
Contradiction: You have never graduated and this is the reason why you're so irritated. 
Contradiction: A child is swinging.