Anchor: Zarco happened upon a small volcanic archipelago 1,000 km from Lisbon.
Entailed: There is a volcanic archipelago 1000 km from Lisbon.
Contradiction: Zarco did not make any discoveries.
Contradiction: The man kept Susan to himself. 
Contradiction: A man is expressing a belief.
Contradiction: A sword-swallower.
Contradiction: People watching a beautiful sunset on the sea side.