Anchor: Funchal, the island's capital, major harbor, and only city of any note, merely hints at Madeira's riches.
Entailed: Madeira's capital city is Funchal.
Contradiction: Madeira has no hidden riches.
Contradiction: I don't like volleyball. 
Contradiction: A man is outside.
Contradiction: the man is in the shower
Contradiction: You can walk out to the island at low tide.