Anchor: The one item that did not change in the Postal Service update was the contingency.
Entailed: There was one item that didn't change in the Postal Service update.
Contradiction: There was not one item that didn't change in the Postal Service update.
Contradiction: The two twin boys are shoveling snow.
Contradiction: The CIA and Mossad communicate.
Contradiction: The landmarks of the Constitution can provide little help to us after 9/11. 
Contradiction: My mom had an old cat that got hit by a car.