21.   All were taken over by highjackers who avoided airport detection and apparently did not hesitate to turn the flights into suicide missions.

22.   But as major Internet service providers begin to deploy the new technology, he said, it will be increasingly difficult for commercial spammers to avoid detection.

23.   But if they want to leave, they now have to go farther out along the coast to avoid detection.

24.   But individuals linked to terrorist groups appear to be relying on more low-tech methods to avoid detection.

25.   But law enforcement officials say that the increased globalization of electronic money transfer systems has made it easier than ever to move cash and avoid detection.

26.   But the incident and qualms that Iguchi was able to avoid detection for so long, has begun to undermine confidence in the banking system.

27.   But that does not prevent spammers from signing up for free trial accounts and spamming until they get kicked off, or forging return addresses to avoid detection.

28.   Drug couriers who are carrying narcotics internally, usually by swallowing condoms containing heroin, would surely want to avoid detection through an X-ray.

29.   Flying low enough to avoid detection, she has focused on TV movies and other small-budget projects in recent years.

30.   Flying at night to avoid detection, Levett and his colleagues airlifted the supplies to Israel in defiance of a U.N. arms embargo on the Middle East combatants.