Anchor: A black dog walks on the beach near the rocks.
Entailed: A black dog walks on the beach near the rocks.
Contradiction: A black dog is running in the backyard.
Contradiction: The old fishing port is abandoned, isn't it?
Contradiction: a man in a tank top
Contradiction: There is no test called the Rauch-Reich test. 
Contradiction: There was a rocket crash in China in 1996.