Anchor: It must have been quite twenty minutes before Poirot rejoined me. 
Entailed: Poirot rejoined me after twenty minutes.
Contradiction: Twenty minutes later, there was still no sign of Poirot.
Contradiction: Rosenberg wrote a workbook about banking and finance.
Contradiction: A bus is full of people
Contradiction: Chinese money.
Contradiction: We will not approve of such a result.