Anchor: A group of children appear to be playing outside.
Entailed: children are playing
Contradiction: the children are asleep
Contradiction: It's a new carpet sweeper that picks up rocks off the lawn. 
Contradiction: Patients are less likely to seek counseling if they are confronted with their levels of blood alcohol.
Contradiction: Two people row their boat over a waterfall.
Contradiction: I did it a lot.