Anchor: The British used Patna for manufacturing and distributing opium in the 19th century, to keep China supplied with its favorite drug.
Entailed: Patna was used to provide China with Opium.
Contradiction: The British did not provide the Chinese with Opium.
Contradiction: It seems that commercial software works better than free.
Contradiction: Someone is outside.
Contradiction: A man sits atop a large mountain of rocks.
Contradiction: The old man is looking at the mug.