Anchor: The 130 years of Portuguese control proved precarious.
Entailed: The 130 years of control by the Portuguese proved to be uncertain. 
Contradiction: The 130 years of control by the Portuguese proved to be stable.
Contradiction: Two dogs leap and fight over the frisbee.
Contradiction: A football game is playing.
Contradiction: The dog is sleeping on the rug.
Contradiction: The man entertains crowds of people with his accordion