Anchor: The creation of the H-2A program was controversial, given the history of prior temporary agricultural programs such as the Bracero program.
Entailed: The Bracero program was a temporary agricultural program.
Contradiction: The creation of the H-2A program was well received by all.
Contradiction: There are no sidewalks in the city.
Contradiction: The people have cameras.
Contradiction: I do not think you should just look at gerbils.  
Contradiction: A swimmer at a race.