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Figure 2 shows the various elements that can make up the client tier . This may result from the source of this gas : for instance , since refractory elements in molecular clouds are mostly trapped in grains , a process which extracts the gas from these clouds before it gets heated ( thus without extracting the grains ) might explain a low abundance of these elements . However , adjustment of other elements of the DICE model could easily close this gap , including incorporation of the risk of higher-damage cases and imposition of a backstop-technology ceiling on abatement costs ( as discussed below ) . This course is intended to provide a broad introduction to key elements of American law . Actual data objects are stored as elements , and elements are grouped together in packages within a bucket .