Anchor: Steel erection and minor excavation and concrete work is necessary for an ACI system, and this work should not require any more than very common construction equipment.
Entailed: An ACI system requires steel erection and minor excavation.
Contradiction: An ACI system does not require any excavation.
Contradiction: The boy is petting a kitty in the kitchen
Contradiction: A woman is sitting.
Contradiction: She did not say anything since she is very shy.
Contradiction: A dog is running.