Anchor: There are three people on the dock by the boats.
Entailed: Three people are near the water.
Contradiction: No one is at the marina today.
Contradiction: The original part of the wall is far from the school. 
Contradiction: In addition to this some organizations used e-mail to communicate non-sensitive information to their memberships.
Contradiction: Technology-based solutions are never costly.
Contradiction: Frisby did a better job than Woodward.