Anchor: A seagull on a picnic table at a dock.
Entailed: A seagull is on a picnic table.
Contradiction: The bird is soaring through the sky.
Contradiction: A seagull is not on a picnic table.
Contradiction: An owl on a picnic table at a dock.
Contradiction: The seagull is flying over the water.
Contradiction: a dog chases a bird on a beach