Anchor: The trees, originally planted by the Carthaginians in 300 b.c. or thereabouts, thrive under irrigation.
Entailed: The trees are able to thrive due to irrigation. 
Contradiction: The trees all die because there isn't enough irrigation to keep them hydrated. 
Contradiction: Knowledge of the web address is not necessary.
Contradiction: My estimate is that people might be able to cut the cord entirely within two or three years.
Contradiction: We used to live on a big house in the suburbs before buying this one.
Contradiction: Several people are sitting next to each other.