Anchor: One of them offered her a tour of their town and she accepted.
Entailed: She and her group were offered a tour of their own and she accepted. 
Contradiction: She rejected the tour she was offered by a tour guide. 
Contradiction: A polar bear is biting into a chunk of ice.
Contradiction: A man has baked something.
Contradiction: There is only one way to cause the situation.
Contradiction: Many companies avoid unneeded difficulties.