Anchor: That is arsenic ”not strychnine, said Poirot mildly. 
Entailed: Poirot pointed out that it was not strychnine, but arsenic.
Contradiction: Arsenic and strychnine are the same thing.
Contradiction: It never gets very cold.
Contradiction: There is a group of young people together on the campus.
Contradiction: Mintzburg wrote about strategic planning..
Contradiction: It's a distraction to have another head in the picture.