Text: North American Electric Reliability Council (NERC), Impact of FGD  Availability Losses Experienced by Flue Gas Desulfurization Systems, NERC Generating Availability Trend Evaluations Working Group, July 1991.
Entailment: NERC analyzed the trend of availability due to flue gas desulfurization systems.
Contradiction: The North American Electric Reliability Council is not concerned with flue gas desulfurization systems.