Anchor: Two black dogs chase each other on grass.
Entailed: Black dogs chase each other on grass.
Contradiction: Two black cats chase each other on grass.
Contradiction: McDonald's never allows franchisees to order menu items other than hamburgers. 
Contradiction: There are a lot of freebies you could get.
Contradiction: A women rides her pink hello kitty bike.
Contradiction: A lady talks on a cellphone.