Anchor: If the RWC is &lt;25% effluent the concentrations may  (1) 4 times the RWC, (2) 2 times the RWC, (3) RWC, (4) RWC/2, and (5) RWC/4.
Entailed: If the RWC is under 25%, the concentrations vary.
Contradiction: Even if the RWC is under 25%, the concentrations do vary.
Contradiction: A man stands inside a playground.
Contradiction: The boys are doing karate.
Contradiction: The PK will blame women.
Contradiction: A person wears protective clothing of some sort.