Anchor: Prefabrication has been used since the early 1990's, notably on two large retrofit  the 1300 MWe Zimmer Station and the 2600 MWe Gavin station.
Entailed: Since the early 1990's, prefabrication has been used, mainly by two large stations.
Contradiction: Prefabrication has been used since the 1880's.
Contradiction: Two females singing onstage.
Contradiction: The awareness manager developed guidelines to tell people about the new standards.
Contradiction: He blamed Tuppence for not knowing what was about to happen.
Contradiction: National saving includes both federal and nonfederal savings.