Anchor: A man sits on a rock near mountains.
Entailed: A man sits a rock and can see mountains.
Contradiction: A man throws the rock at the mountains.
Contradiction: There are no sandstone rock formations in Timna Park.  
Contradiction: The man is playing music.
Contradiction: The man was dull and lifeless but filled with a resounding hope for better days ahead.
Contradiction:  A boy runs in a race.