Anchor: A man stands in front of a group of adolescents who are seated at computers.
Entailed: There are several people sitting around computers.
Contradiction: The man is sitting down.
Contradiction: I do not work in the education field at all.  
Contradiction: The Soviet Union thrived under their lead in the space race after the Challenger disaster that devastated NASA. 
Contradiction: A truck drives down a country road in the sunshine.
Contradiction: The snowboarder is outdoors.