Anchor: A group of men are sitting around a table.
Entailed: A group of people are not standing.
Contradiction: A group of guys are skiing down a hill.
Contradiction: Greenwood Great House has always been a communal property, never owned by a single individual or family. 
Contradiction: Students are engaged in a physical activity.
Contradiction: Two children are swimming.
Contradiction: The workers use a jackhammer.