Anchor: Stone Age people found abundant fish in the rivers and dwellings safe from wild animals in the caves riddling the valley cliffs.
Entailed: People of the Stone Age found shelter in the form of caves along the cliffs.
Contradiction: The cliffs were dangerous due to the fact that they were filled with wild animals.
Contradiction: Congressional requests for work by the GAO must be done by telephone. 
Contradiction: He was working on some sort of blueprint.
Contradiction: A man walking down the street
Contradiction: A person running.