Anchor: A man with an orange vest is shoveling rocks.
Entailed: A man is working.
Contradiction: There are no animals by the street. =
Contradiction: Your state income tax is not deductible for federal income tax purposes.
Contradiction: The people are in a library.
Contradiction: He avoided the sword and lived to tell the tale. 
Contradiction: A person skating in a roller derby wearing a red helmet with a white star on it.