Anchor: If receiving water is to be used as the dilution water, caution must be exercised in exposing the test organisms to it, because of the possibility that it might be toxic.
Entailed: Water has possibility of being toxic.
Contradiction: Water never has possibility of being toxic.
Contradiction: Three people are swimming in a pool.
Contradiction: a person sits by a cat
Contradiction: There were no slip-ups last week, and Rubin didn't say anything.
Contradiction: A group of people move in sync for a photo.