Anchor: A matter of considerable discussion in the United States concerns whether the (noshift) own-price elasticity of workshared volume is greater than that of basic volume, as these two categories are now constituted.
Entailed: There is concern in the US whether the noshift own-price elasticty of workshared volume is greater than basic volume.
Contradiction: The categories workshared volume and basic volume are not constituted.
Contradiction: It would be very improbable to miss a spike in toxicity. 
Contradiction: It has snowed recently.
Contradiction: A group of people drinking beer in a bar
Contradiction: They were doing work.