Anchor: It is difficult to overestimate the importance of the sacred island of Delos during ancient times.
Entailed: The sacred island of Delos is very important.
Contradiction: The island of Delos is not very important.
Contradiction: In this era, there is nothing more important than a politician's ability to tell lies. 
Contradiction: A child is playing on a slide.
Contradiction: Their analysis concluded that there was no room to improve on productivity.
Contradiction: The tiny flag that I received in the mail had postage due.