Anchor: Four distinct peoples once inhabited the land now known as  the Picts in the north, the Britons in the southwest, the invading Angles in the southeast, and the Scots in the west.
Entailed: Four different peoples once lived in the land.
Contradiction: The land was inhabited by a single tribe.
Contradiction: The girls at a concert.
Contradiction: These gains have provided the benefit of less dirty air for multiple million people. 
Contradiction: The man and woman were laughing as they waited.
Contradiction: A woman headed toward the other side of the street.