Anchor: A man is sitting in a chair under an umbrella surrounded by pigeons.
Entailed: A man is sitting under an umbrella.
Contradiction: A man is dancing and singing and cooing like a pigeon.
Contradiction: They're not trying to teach computers how to recognize voices.
Contradiction: One dog is not happy with the other dog
Contradiction: A girl is swimming at the pool.
Contradiction: A bicyclist is doing something he shouldn't.