Anchor: Ammonia and urea are the reagents used along with a catalyst to remove NOX from the flue gas stream.
Entailed: Ammonia works with a catalyst.
Contradiction: Ammonia is a catalyst
Contradiction: The store ran out of sausages and the hook is empty.
Contradiction: The clues haven't led anywhere.
Contradiction: A snowmobile going down a hill
Contradiction: It also acts as an incentive for agencies to stay vigilant, and keep up the efforts to address the wasteful spending that results from lapses in controls that lead to improper payments.