Anchor: Although all the facts are not known, it is perplexing how such a basic error involving billions of dollars could go undetected by the auditors.
Entailed: A billion-dollar error was undetected by the auditors. 
Contradiction: The auditors have never failed to detect an error. 
Contradiction: I wear that every day.
Contradiction: Where in Texas have you played?
Contradiction: The market is open during Sunday only at noon.
Contradiction: The Star Ferry or outlying island ferry trips appeal to children who like boats.