11.  For consumers who know what they want, the discounters still offer useful services.

12.  Genes that do not recombine eventually cease to provide useful service to an organism trying to survive in a changing environment.

13.  Kors and Silverglate have performed a useful service too.

14.  Links to useful services from the Social Security Administration, other government agencies.

15.  One of the big changes on the Web over the last few years has been the addition of truly useful services.

16.  Retired leaders can sometimes perform useful services for their governments.

17.  The most useful service I provide is a master plan.

18.  The Travel Toolkit section has links to two very useful online services.

19.  They also said Cobble Hill was popular because it was increasingly seen as an architecturally distinctive, slightly more raffish area, with more useful services.

20.  They provide no useful service.