21.   On a handful of occasions, judges and former law clerks say, the conservative majority has successfully prevented the release of judicial opinions that displeased them.

22.   The biggest distinction is that the Chernobyl design lacks a containment structure to help prevent the release of radioactivity.

23.   The blast occurred because workers did not complete all parts of a required safety procedure that would have prevented release of the pressurized nitrogen, OSHA said.

24.   The order came too late to prevent the release of the note.

25.   Their destruction techniques, unlike those used by the U.S. troops the year before, were destined to prevent release of chemical weapons into the atmosphere.

26.   They release small amounts of hormone that prevent the release of egg and thicken cervical mucus to keep sperm from joining egg.

27.   Unocal agreed to buy new monitoring equipment to help prevent future releases.

28.   While no drug is yet available that will do it, Wiese and Shlipak maintain that the future of hangover treatment lies in preventing the release of cytokines.

29.   White House spokesman Dan Bartlett said trials for terrorists need to be considered in a separate category to prevent the release of classified evidence or law enforcement techniques.

30.   A former president can still claim executive privilege to prevent the release of certain documents.