Anchor: Installation is staggered by two to three months between sequential units to enable more efficient utilization of manpower and project management than if multiple units were connected at one time.
Entailed: The installation is not in three consecutive months.
Contradiction: All the units need to be connected at once.
Contradiction: The snowboarder is busying writting a book.
Contradiction: The spire was added in the the 15th century.
Contradiction: A boy is sleeping.
Contradiction: Three people are in a car.