Anchor: Wars between the Goths and Byzantines followed by new waves of invasions made Italian unity impossible.
Entailed: Italy was very volatile.
Contradiction: The Byzantines maintained Italian unity.
Contradiction: Immediately upon graduation, she entered medical school. 
Contradiction: Aggregating the needs of business units is one of the roles of corporate IT organizations.
Contradiction: A skateboarder is laying in the grass
Contradiction: A person is playing volleyball.