Anchor: Like Oswald's numbers on housing and unemployment, these numbers might allow a variety of explanations--like families that move are more likely to be poor, and that's why their kids don't do as well.
Entailed: It's possible that children from poor families perform worse and move house more.
Contradiction: The numbers on housing on employment aren't open to interpretation.
Contradiction: A man is eating food.
Contradiction: A street lined with walls and power lines has cars driving down it
Contradiction: The fortress up the hill is actually made out of two castles. 
Contradiction: Positive subsidy costs and negative subsidy costs are equal.