Anchor: Three surgeons operate on a patient while wearing magnifying lenses on their safety glasses.
Entailed: Three surgeons are working.
Contradiction: Three lumberjacks are performing surgery.
Contradiction: John did not practice law in the city nor the country.  
Contradiction: People going to or leaving some kind of event.
Contradiction: Unlock him please.
Contradiction: My boss's truck gets 17mpg.