21.   Clinton administration officials said they expect to sign an agreement to stem the flow of chemicals used in chemical weapons and in the production of illegal drugs.

22.   Congress and Clinton sparred earlier this year over whether Mexico was doing enough to stem the flow of illegal drugs across the U.S. border.

23.   Conventional methods of stemming the flow have failed.

24.   Cosandey, the Zurich prosecutor, said anonymous accounts make it harder for law enforcement officials to stem the flow of illegal money through the banking system.

25.   Critics of the law argue it will do little to stem the flow of illegal guns.

26.   First Europe stemmed the flow by imposing quotas.

27.   Fox said that the EPA would decide sometime this fall if it will move much more swiftly than anticipated to stem the flow of PCBs from sediment to water.

28.   France has long fought for the right to stem the flow of foreign-language entertainment into the French market.

29.   For years the government has been trying and failing to stem the flow of drugs by sealing the border.

30.   Fox has repeatedly said Mexican authorities are working harder to stem the flow of illegal immigrants who pass through Mexico on their way to the United States.