Anchor: A person is writing on a chalkboard in a empty classroom.
Entailed: There is a chalkboard in the room.
Contradiction: A woman is sweeping the floor.
Contradiction: A woman sunbathes on a lovely day.
Contradiction: Technology was becoming critical.
Contradiction: There were signs that Tommy was going to talk endlessly.
Contradiction: Preserving generation of electricity and reliability of transmission is towards that end.