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RTOs employ three , five , seven or more chambers that store and recycle heat energy . For example , if the Web service returns 100 data components , but if your application only uses two or three , MDS detects that and only returns those data components that you are actually using in your application . " Verizon set out to use SOA to reduce support costs by consolidating these core functions from 20 or 30 implementations to one or three , in each case . The wardens of the country were sixty in number , and the wardens of the city will be three , and will divide the twelve parts of the city into three ; like the former , they shall have care of the ways , and of the different high roads which lead out of the country into the city , and of the buildings , that they may be all made according to law ; - also of the waters , which the guardians of the supply preserve and convey to them , care being taken that they may reach the fountains pure and abundant , and be both an ornament and a benefit to the city . In addition , as shown by Group three , sometimes both the regional and the national citizenry need to be involved in different although related policy-making processes , for example , with respect to land .