Anchor: As a practical matter, mailers are believed in many cases to be able to do this work for a fraction of the cost the postal service would face.
Entailed: Mailers are believed to be cheaper than the postal service.
Contradiction: The postal service generally costs less than mailers.
Contradiction: Shorts are acceptable clothing in today's weather.
Contradiction: Mother Teresa loved animals. 
Contradiction: The president's mother died several years ago.
Contradiction: Is that weather very common there in North Carolina?