Anchor: If I really own my modem, then I must have an unqualified right to dial up anywhere, any time, and suck in whatever is out there to be sucked.
Entailed: If I own a modem then I have the right to dial up anywhere.  
Contradiction: Just because I own a modem does not mean I can just dial up anywhere.  
Contradiction: People are walking along the beach.
Contradiction: A person riding a unicycle.
Contradiction: The governor and his wife set out to cause riots among the residents of Saint-Pierre.
Contradiction: People who know each other huddle together to take a photo.