Anchor: A dog jumps for a red ball on the grass.
Entailed: A dog is playing outside.
Contradiction: A dog is rolling around in mud.
Contradiction: The man is sitting on the ground leaning against his bike.
Contradiction: The research should include studies on the use of no-cost services
Contradiction: It is not possible to meet these methodological requirements. 
Contradiction: Some slaves that had run were killed.