11.   Fifty years ago, the federal government set up an elite corps of medical detectives to counter a threat it hoped never to face.

12.   Gore thinks the threat is being countered by an investigating team headed by our diplomat Frank Wisner and their space agency head, Yuri Koptev.

13.   It says it needs the aircraft to counter threats from Iran and Iraq.

14.   Most observers regard the current threats and counter threats as part of the brinksmanship that generally accompanies U.S.-China negotiations.

15.   Most of the major FBI field offices were described as unable to counter terrorist threats in their respective regions, officials said.

16.   Nevertheless, government agencies at all levels say they are gearing up to counter the threat.

17.   President Vladimir Putin of Russia acknowledged that there might soon be a need to counter nuclear threats from unpredictable powers like North Korea.

18.   Reagan used his speech to assure western Europeans that the United States would stand with them to counter the threat posed by then-communist Soviet Union.

19.   Schmalensee said that Microsoft had spent money on research to counter that threat.

20.   Supporters said the legislation would provide airports with the tools to counter terrorist threats.