Anchor: Only one son had survived to tell of the disaster.
Entailed: The man lived to tell about the event.
Contradiction: All but one man survived. 
Contradiction: The man is walking passed a bench.
Contradiction: The Greek mainland was invaded by Persia during the reign of Darius.
Contradiction: The pump is very difficult to squeeze.
Contradiction: A summary of the main characteristics of the critical instance case study can be found in table 3.3.