Anchor: However, one certainty is that the U.S. population is aging and there will be fewer workers supporting each retiree.
Entailed: the aging of the U.S. population is considered a certainty.
Contradiction: the aging status of the U.S. population is considered an uncertainty.
Contradiction: Two young children are sitting on lounge chairs.
Contradiction: Dogs outdoors engaging in rivalry.
Contradiction: An unhappy crying man is walking down the street.
Contradiction: They will stop the buck.