Anchor:  Controlling SO2;  A Review of Technologies
Entailed: SO2 can be controlled.
Contradiction: There is no method with which SO2 can be controlled.
Contradiction: The duck is beside the pool.
Contradiction: A track with bikers racing on it.
Contradiction: The last thing you do is waive you trial by jury.  
Contradiction: It took less than three weeks for General Miles to gain control of the island.