Anchor: Seagulls fly in the sky over the water where a boat sails past rocks.
Entailed: Seagulls fly over a boat.
Contradiction: The boat was docked by a flock of toucans.
Contradiction: The birds are perched on the rocks by the sea.
Contradiction: Crows fly in the sky over where a boat sails past rocks.
Contradiction: The water is very shallow.
Contradiction: The seagulls are on the water.