Anchor: Significantly, under GAO's statutory access authority, Congress provided the President and the Director of the Office of Management and Budget a safety valve to preclude judicial enforcement of GAO's access rights.
Entailed: Congress provided the President a safety valve.
Contradiction: Congress did not provide the president with a safety valve.
Contradiction: Two men are dancing.
Contradiction: The children are running barefoot.
Contradiction: The cow is not sacred. 
Contradiction: a horse in midair