Anchor: About 50% of the population is still under 20 years of age.
Entailed: Half of the population is between the ages of zero and twenty years old.
Contradiction: Only a quarter of the population is under the age of 20 years old.
Contradiction: Keats wrote limericks. 
Contradiction: A football cocach is telling a player the next move for the game.
Contradiction: Adults are walking in the rain.
Contradiction: A young lady was smiling as she enjoyed her day on the beach.