Anchor: It is being watched at the back as well, so they are quite sure of that.
Entailed: The back is being watched by them too.
Contradiction: No one was checking out the back.
Contradiction: She doesn't like to play fetch, and she will just sit there after you throw it.
Contradiction: You can take home a lot of local food from your vacation in Spain.  
Contradiction: Two men fight over a  hat.
Contradiction: The harbor is a good place to start to get a good sense of Nagasaki's personality.