11.  In Europe, the railroads remain vital components of the transportation system.

12.  Nonetheless, Commander Bryant and other women on the Pittsburgh force say the skills women bring to the job add vital components to policing.

13.  Nonetheless, Ms. Bryant and other women on the Pittsburgh force say the skills women bring to the job add vital components to policing.

14.  The disappearance of some vital electrical components has forced organizers to scale down plans for a giant rotating stadium scoreboard for the Goodwill Games that open Saturday.

15.  The notion of information has become a vital component of modern theories of black holes and of the origin of quantum mechanics.

16.  The stout mice are knockouts that lack the gene for leptin, a vital component in the regulation of body weight.

17.  The thio esters are also akin to a vital component, known as acetyl coenzyme A, of the energy metabolism pathway known as the citric acid cycle.

18.  This is because tone is a vital component of meaning in Chinese.

19.  Who among us considered a Mills and a LaFleur such vital components?

20.  Clad in jeans and a black Armani Exchange T-shirt, Falcon said such tactics make the paramilitary group a vital component to government security forces.