Anchor: Using BLS weights, can compute an estimate of the aggregate US population demand function for postage from the household sector as the weighted sum of sample household level-demand functions Can compute own-price and cross-price elasticities of aggregate household demand for postage using this aggregate demand function.
Entailed: The demand for postage can be calculated by using BLS weights.
Contradiction: The BLS function is useless in performing postage calculations.
Contradiction: I have boys and absolutely no girls.
Contradiction: Someone placed the glasses on the checkerboard.
Contradiction: A difference does not exist. 
Contradiction: It was moved to make room for the railway station.