Anchor: In addition, the signature should be linked to the data in such a manner that if the data are changed, the signature is invalidated.
Entailed:  the signature should be linked to the data
Contradiction:  the signature should not be linked to the data
Contradiction: Tipper was in every episode that aired from that show.
Contradiction: The collaborative care approach has dominated the published studies on trauma center interventions.
Contradiction: Being a city built on an island, the population is extremely low, like 100 people.
Contradiction: two dogs runs through the grass