Anchor: Control should be installed at an application's interfaces with other systems to ensure that all inputs are received and are valid and outputs are correct and properly distributed.
Entailed: It should be ensured that all inputs are valid.
Contradiction: It should be ensured that all inputs are invalid.
Contradiction: Two puppies laying down.
Contradiction: We cannot wait for our son to graduate so we can have more freedom.
Contradiction: The market is empty
Contradiction: There is snow