Anchor: In the ninth century they built a fort on the Liffey and founded Ireland's first town Dubh Linn or  Black Pool. 
Entailed: They built a fort on the LIffey.
Contradiction: They didn't build a fort.
Contradiction: It's not working at all
Contradiction: A black man is outside a building
Contradiction: The verification of receipt and acceptance isn't required at all under fast pay procedures.
Contradiction: Peoples are eating near campfire.