11.   Other instructors made a point of calling students who signaled their problems about continuing college by not applying for financial aid.

12.   Pecoriello agreed, but he said the surprise may actually signal a problem.

13.   Raytheon said Friday the US Justice Department has asked for more information about the planned purchase, a second request that often signals antitrust problems.

14.   Since these symptoms can signal other problems, sufferers sometimes find themselves running the gamut of doctors trying to get a diagnosis.

15.   The company itself signaled profit problems in a public statement last week.

16.   The failure of the talks signaled serious problems not only for Nissan but for other auto makers.

17.   The failure of the negotiations signaled serious problems not only for Nissan but also for many other automakers.

18.   The Nasdaq fall signaled serious problems in the companies in the new economy.

19.   The study did not address just when an abnormal behavior signals a serious problem.

20.   They could monitor home security systems, smoke alarms, vending machines, street lights and fuel tanks to signal problems.