Anchor: legal authority allowing GAO to undertake work on its own initiative that is intended to support the Congress (research and development work).
Entailed: GAO's ability to take on work on its initiative requires legal authorization.
Contradiction: GAO's ability to take work on its own initiative doesn't require legal authority at all.
Contradiction: The dog is digging a hole in the sand on the beach.
Contradiction: The judge tried to avoid anything that would cause a mistrial.  
Contradiction: Colonial palaces are being restored in New Havana.
Contradiction: The visit to see Charlie,  a 13 foot crocodile who swims up to the boat when called, is the highlight of the trip.